Pediatr Radiol (2009) 39 (Suppl 3):S548–S589 DOI 10.1007/s00247-009-1241-6

# Springer-Verlag 2009

Posters P1 Supracardiac partial anomalous pulmonary venous return of right pulmonary veins in a 11-year-old boy: Multidetector CT appearance Nagihan Inan, Kadir Babaoglu, H Tahsin Sarisoy School of Medicine, University of Kocaeli Background Echocardiography typically used to delineate the anatomy of the pulmonary venous drainage and the septum. But sometimes it is difficult to detect the pulmonary vein confluence by echocardiography and catheter-based angiography. CT and MRI may be used to further delineate the cardiac anatomy. Several previous reports showed that CTA has some advantages when compared to other imaging modalities. On the contrary of catheter angiography, it is a non-invasive technique. In addition, it has more spatial resolution than MRI. Objective To evaluate the value of multidtector computed tomography in the diadnosis of Partial Anomalous Pulmonary Venous Return. Materials and methods A 11-year-old male was admitted to the our Paediatric Cardiology Unit for a cardiac murmur. Transthoracic echocardiography showed mild dilatation of the right atrium and the right ventricle with increased superior caval vein flow and minimum secundum atrial septal defect. This examination revealed two of four pulmonary veins draining into the left atrium. It was suspected supracardiac partial abnormal pulmonary venous return. The patient was referred to our multidetector computed tomography (MDCT) department for preoperative further evaluation of vascular abnormalities. MDCT was performed on a 64-detector-row CT scanner (Aquillon; Toshiba Medical Systems, Tokyo, Japan). After scanning, we transferred the MDCT data sets to an independent workstation (Vitrea, Toshiba) for postprocessing CT angiography (CTA). Results CTA confirmed that right pulmonary veins connect to the innominate vein with subsequent drainage to the right superior vena cava and to the right atrium (Fig. 1). These findings were confirmed at operation. Conclusion In conclusion, as the role of CTA as a imaging modality is increasing, rare congenital heart disease such as PAPVR need to be recognized on MDCT. P2 Multidetector CT findings of a case with Tetralogy of Fallot with left pulmonary artery atresia Nilay Akhun, Yonca Anık, Nagihan Inan, Sevtap Gumustas, Ali Demirci Radiology Department, Kocaeli University Hospital Background Tetralogy of fallot in an anomaly respresenting with infundibular right ventricular outflow obstruction, subaortic ventric-

ular septal defect, right ventricular hypertrophy and dekstraposition of the aorta. Objective In this case, our purpose is to represent 64 detectors CT findings of the tetralogy of fallot with left pulmonary artery atresia and right pulmonary artery reconstruction after surgery. Materials and methods In this case, we respresented detailed 64 detectors CT muliplanar reformatted and three dimentional images of the tetralogy of the fallot findings, left pulmonary atresia, right pulmonary artery reconstruction after surgery, in 11 years old girl. Results 64 detectors CT revealed right sided arcus aorta, dilatation of the ascending aorta, left pulmonary atresia, reconstruction of the right pulmonary artery, dilatation of the right atrium and ventricle in patient followed up with the diagnosis of tetralogy of fallot. We represented multiplanar reformatted and three dimentional images of this patient. Conclusion 64 detectors CT imaging modality has an important contrubution for detailed imaging of the tetralogy of fallot disease with the help of MPR and three dimentional images. P3 Congenital aorta and vena cava anomalies: 16-detector-row CT imaging findings Omer Onbas1, Mecit Kantarci1, Mustafa Koplay1, Hasim Olgun2, Fatih Alper1, Bulent Aydinli3, Huseyin Zirek1, Naci Ceviz2 1. Departments of Radiology, School of Medicine, Ataturk University, Erzurum, Turkey 2. Departments of Pediatric Cardiology, School of Medicine, Ataturk University, Erzurum, Turkey 3. Departments of General Surgery, School of Medicine, Ataurk University, Erzurum, Turkey Background Echocardiography is an initial diagnosis method used in patients with suspected congenital cardiovascular disease. However, although it provides sufficient evidence in many of the newborns, in some patients, particularly in those with great artery-vein anomaly, it has offered limited use. Objective To demonstrate the radiological images of congenital anomalies of the aorta and vena cava within a wide spectrum obtained through multidetector computed tomography imaging (MDCT). Materials and methods The scans were performed at sections of 1– 2.5 mm, reconstruction intervals of 1 mm, and a helical pitch of 1 value. mAs values for infants and young children were 50–80. Nonionic contrast media (2 ml/kg) was given with an automatic injector. Imaging was performed on axial plane after proper phase for the aorta and the vena cava was determined. After the basic images of all the patients acquired on axial plane were evaluated in detail, using special computed software and multiplanar reconstruction, maximum intensity projection, curved planar reformation, shaped surface display, and

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volume rendering methods, images of 2 or 3 dimensions on different planes were developed. Results Based on these images, congenital aorta and vena cava anomalies and accompanying anatomic variations were clearly observed. With its volumetric imaging quality, MDCT angiography demonstrates the aorta, vena cava, and pulmonary artery and their branches. Conclusion The main diagnostic method for detection of vascular structuries is conventional angiography. Because of recent advances in CT technology, MDCT angiography has replaced conventional angiography in most clinical applications. MDCT angiography is a relatively new method and it is very useful in the diagnosis and management of congenital aorta and vena cava anomalies. P4 Tetralogy of Fallot with left pulmonary artery agenesis and a right-sided aortic arch: 16-slice CT findings Nilgun Isiksalan Ozbulbul Radiology, Turkiye Yuksek Ihtisas Hospital Background Congenital absence of one pulmonary artery is a rare entity. It may occur as an isolated lesion or in combination with other cardiac or vascular lesions. Less than 2% of patients have the aortic arch on the same side as the absent pulmonary artery. The most frequently associated anomalies include tetralogy of Fallot or septal defects. The blood supply to the affected lung is achieved via bronchial arteries, MAPCAs, and other systemic arteries, such as intercostal and transpleural vessels. Patients with tetralogy of Fallot and unilateral absence of a pulmonary artery are a high-risk group for whom there is no consensus on the correct approach to medical management.Multidetector technology provides important information with high accuracy and specifity for anatomic details of congenital heart disease for the referring cardiologist. Objective We present the MDCT angiography findings of a 14-yearold girl who have tetralogy of Fallot with left pulmonary artery agenesis and a right-sided aortic arch. Materials and methods We performed thorax CT angiography with a 16-slice CT scanner (Lightspeed 16, GE, Wis). Results MDCT study demonstrated unilateral left pulmonary artery agenesis. Also, elevation of the hemidiaphragm on the affected side, ipsilateral small hilum, and ipsilateral mediastinal shift were seen. CT scan confirmed the large VSD, right ventricular outflow obstruction, right ventricular hypertrophy and aortic over-ride. In addition, a rightsided aortic arch was present. Large aortopulmonary collateral arteries (MAPCAs) were identified arising from descendan aorta. No associated coronary anomaly was detected. Conclusion MDCT angiography is a good diagnostic modality for use in the evaluation of the congenital heart disease. P5 Vascular rings in children: CT evaluation and 3-D image superimposition Chao Jan Wang, Wan Chak Lo Chang Gung Children’s Hospital Background Vascular compression on the airway in children is usually caused by the congenital anomalies of great vessels. The

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most common congenital anomalies associated with airway compression are the vascular rings. The emergence of multidetector row computed tomography (MDCT) and the advance of post-processing technology have revolutionized the imaging presentation of the congenital anomalies of pediatric airway and vascular rings. Objective To evaluate the great vessels and the tracheobronchial tree in children with congenital vascular ring by using MDCT and three dimensional image reconstruction and superimposition. Materials and methods From January 2006 to October 2008, eighteen children, 10 male and 8 female, age ranging from 1 month to 12 years, undertook CT examination under the impression of upper airway obstruction with possible vascular compression due to vascular ring. Sixteen or sixty-four slice CT scanners were used for volumetric dataset. Then all the sub-millimeter thin-slice reconstructed axial images were processed on a workstation. Multiplanar display and three-dimensional images were accomplished in every case, focusing on the relationship of the great vessels and the tracheobronchial tree. Results Vascular rings including double aortic arch, pulmonary artery sling, right-side aortic arch with Kommerell diverticulum and left-side aortic arch with aberrant right subclavian artery were demonstrated. Extrinsic airway compression of variable severity was well depicted by the three-dimensional superimposition images of the great vessels and the tracheobronchial tree. All had bronchoscopic correlation and some were surgically confirmed. Conclusion Imaging plays a crucial role in the diagnosis and treatment of vascular compression of the airway in children. With the advances of MDCT technology and 3D volume rendering capability, it can offer precise anatomy required for surgical planning and it may replace barium swallow, magnetic resonance and conventional angiography while dealing with cases of vascular rings. P6 CT features of mediastinal lymphangiohemangioma with pericardial invasion in a 6-year-old boy Siu-Cheung Chan, C Hsueh, K-K Ng Chang Gung Memorial Hospital, Keelung, Taiwan Background Discuss the CT manifestation of mediastinal lymphangiohemangioma with pericardial invasion in the 6-year-old boy. Case report We report a case of huge cystic anterior mediastinal mass in a 6-year-old boy with progressive substernal pain. Enhanced CT scan revealed a huge anterior mediastinal mass with homogeneous enhancement and mass effect which displaced the heart posteriorly. A histological diagnosis of lymphangiohemangioma with pericardial invasion was obtained by radical mass excision and partial pericardiectomy. Discussion Mediastinal lymphangiohemangioma, a rare hybrid tumor composed of both vascular and lymphatic components, is a rare primary mesenchymal tumor. CT is useful in the diagnosis of mediastinal lymphangiiohemangioma due to intense contrast enhancement of the intratumoral vascular spaces. Different types of enhanced patterns in CT scan, including focal areas of homogeneous, inhomogeneous enhancement or, lack of contrast enhancement were reported, and they were believed due to varying vascularity of the lesions. Although the definitive diagnosis of lymphangiohemangioma

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depends on histopathology, lymphangiohemangioma should be suspected in a case of a mediastinal mass with different components including well-enhanced vascular spaces and cystic appearing areas. CT is helpful to assess the extension of the tumor and the possible associated complications. P7 Massive pulmonary ossification due to recurrent aspiration pneumonia Bilal Battal1, Murat Kocaoglu2, Fatih Ors2, Sabahattin Vurucu3 1. Radiology, Sarikamis Military Hospital, Kars, Turkey 2. Radiology, Gulhane Military Medical School, Ankara, Turkey 3. Pediatric Neurology, Gulhane Military Medical School, Ankara, Turkey Background Pulmonary ossification (PO) is an idiopathic disorder and presents with the formation of mature bone in the pulmonary parenchyma. This entity has been reported in a number of diseases such as chronic bronchitis, busulfan therapy, cystic fibrosis, congestive heart failure, myositis ossificans and idiopathic interstitial fibrosis, and usually seen in older age groups. We present a child with PO due to recurrent aspiration pneumonia. Objective To present clinical and imaging findings of a 4-year-old male with massive PO secondary to recurrent aspiration pneumonia. Materials and methods A 4-year-old male who had mental and motor retardation, epilepsy, dysfunctioning epiglottis and recurrent aspiration pneumonia was evaluated by chest radiography, high resolution computed tomography (HRCT) and cranial magnetic resonance imaging (MRI). Results On physical examination bilateral rales were detected. Hematological tests and sputum culture were unremarkable. Hypercapnia and hypoxemia were present. A cranial MRI, which was obtained for assessing epilepsy showed cerebral atrophy. The chest radiography revealed bilateral reticulonodular pulmonary infiltrates, patchy consolidation and pneumonic infiltrates resembling organizing pneumonia. Bilateral patchy radioopacities consistent with calcification were also noted. HRCT showed bilateral subpleural or peribronchial areas of consolidation associated with massive ossification. Conclusion Recurrent aspiration pneumonia may result in extensive PO in children; however, more cases are necessary to be able to conclude whether this finding has prognostic and therapeutic implications. P8 Vascular ring anomalies in children—A pictorial review V Chidambaram, KJ Au-Yong, M Jones, D Bakalinova University Hospital of North Staffordshire, UK Background A wide spectrum of congenital abnormalities of the aortic arch and its branches can occur due to the failure of fusion or regression of the vascular arches. These abnormalities can cause symptoms of like stridor, dyspnoea, dysphagia and cyanosis due to the compression of trachea or oesophagus. Objective To review the normal embryology of the aortic arch. To provide a pictorial review of the various types of congenital vascular ring anomalies.

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Materials and methods Our exhibit demonstrates aortic arch and other types of vascular ring anomalies using a combination of imaging modalities including chest x-ray, barium oesophagography and MDCT. We will illustrate the vascular anatomy and its effects on the adjacent oesophagus/tracheobronchial tree using cross sectional imaging, MIP, multiplanar reformats (MPR) and volume reconstruction. Results We will classify and depict the different types of aortic arch anomalies using Edwards’s classification: Group 1: Double aortic arches- both arches patent, one arch atresia Group 2: Left aortic arches- normal branching, aberrant subclavian Group 3: Right aortic arches- mirror branching, aberrant subclavian We will also demonstrate some other types of vascular rings. Conclusion It is crucial for pediatric radiologist to be familiarized with the anatomical variants and findings of the various aortic arch anomalies. The diagnosis of the surgical significant vascular tracheoesophageal compressive syndrome (VTECS) will allow for prompt and timely interventional when required. The proper use of imaging algorithm will avoid unnecessary investigation or radiation. P9 Pain chest X-ray: A reliable tool for the evaluation of pediatric patients with pneumonia E Fitsiou1, I Tiliakos1, V Ouranos2, H Moschouris2, MG Papadaki2 1. Department of Pediatric, Tzanio Piraeus Hospital, Greece 2. Department of Radiology, Tzanio Piraeus Hospital, Greece Background Pediatric patients with pneumonia may present symptoms of variable gravity. CRX required to confirm clinical signs and also to verify recovery. Objective Our aim is to highlight the role of CXR in diagnosis and follow-up of children with pneumonia. Materials and methods In a six month period, 47 children with pneumonia, aged 30 days to14 years, (median age 4,5 years) were hospitalized in our department. We recorded the clinical severity and the duration of symptoms and we correlated them with CXR findings. All children had at least one CXR upon admission. Recurring CXRs were obtained according to clinical criteria. Results 14 children (30%) were admitted the day symptoms appeared, 29 children (62%) 2–5 days later, while 4(8%) had symptoms for more than 5 days before hospitalization. Tweenty children (42,5%) presented severe symptoms and admission CRX demonstrated lobar (4/20) or segmental consolidation (16/20). 27 patients (57,5%) with segmental consolidation presented minor clinical symptoms. Thirty-four children (72%) had a recurring CXR during hospitalization. Most of the 2nd CXRs (74%) were obtained on the 4th–8th day of hospitalization, and only one case did not reveal improvement. CXRs obtained before the 4th day of hospitalization showed no improvement in 4 out of 5 patients. The majority of patients (89%) showed signs of recovery between the 2nd and 4th day of hospitalization. Recovery was confirmed with a 2nd CXR for 29 patients (91%) while in 3, 2nd CXR did not reveal signs of improvement. CXR of patients with persistent symptoms confirmed stability. 3rd CXR was obtained in only 3 children with continuing signs of pneumonia or complications(empyema). Conclusion Plain chest x-ray is a reliable tool for the evaluation of pediatric patients with pneumonia. Upon admission, CRX findings reliably confirm severity of clinical signs. In the majority of cases a

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2nd CXR, confirms recovery when performed on the 4th–8th day of hospitalization. A 3rd CXR is necessary when complications are encountered. P10 Pictorial review of central airway anomalies / abnormalities in pediatric patients with underlying congenital heart disease: 64 MDCT evaluation with emphasis on 2D and 3D imaging appearance Sanjay P Prabhu, Edward Y Lee Children’s Hospital Boston Background In recent years, multidetector CT (MDCT) has become an essential noninvasive imaging tool for evaluating central airway anomalies / abnormalities in children with underlying congenital heart disease. Objective The goal of this pictorial exhibit is to review: 1) the most updated 64 MDCT techniques for evaluating central airways; and 2) MDCT imaging appearance of central airway anomalies / abnormalities in children with underlying congenital lung disease with an emphasis on 2D and 3D imaging appearances. Materials and methods We retrospectively reviewed 64 MDCT studies performed in children (< 18 years old) who underwent MDCT studies for evaluation of underlying intra and extracardiac congenital heart disease from July 2004 to December 2008 at our institution. Pediatric patient preparation, MDCT scanning parameters with emphasis on low radiation dose technique, and 2D/3D postprocessing reconstruction techniques were investigated in detail. Cases with central airway anomalies / abnormalities were collected and illustrative cases with particular emphasis on their 2D and 3D imaging appearances are presented. Results A wide spectrum of concomitant central airway anomalies / abnormalities was identified in pediatric patients with underlying congenital heart disease. Intrinsic central airway anomalies / abnormalities include tracheal stenosis, anomalous bronchial branching pattern (e.g., tracheal bronchus, cardiac bronchus) and tracheobronchomalacia. Extrinsic central airway anomalies / abnormalities include vascular rings and sling, as well as extrinsic central airway compression secondary to adjacent dilated pulmonary vessels, abnormal position of the aorta, and cardiomegaly. Conclusion The advent of 64 Slice MDCT has played a major role as a non-invasive imaging tool for evaluating central airway anomalies / abnormalities in pediatric patients with underlying congenital heart disease. Understanding updated 64 MDCT techniques and characteristic imaging appearances of central airway anomalies/abnormalities in these children will lead to optimal patient management by providing essential preoperative information of both underlying congenital heart disease and associated central airway anomalies / abnormalities. P11 Thoracic manifestations of systemic diseases, radiological approach Pilar Garcia-Peña, Ignasi Barber, Helena Boixadera, Nuria Toran, Javier Lucaya, Goya Enriquez Hospital Materno-Infantil Vall d´Hebron, Barcelona, Spain

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Background This work will present our experience in the evaluation of the chest in children with systemic diseases during the last six years in our institution. Objective The purpose of this presentation is to review the role of thoracic imaging in children with systemic disorders. Examination techniques and specific systemic conditions with thoracic manifestations will be discussed. Materials and methods During the last 6 years we review 3,000 patients with systemic disease. The most frequent radiological examination techniques were Chest X-ray/CR, Computed Tomography and Nuclear medicine, following by MRI in some cases. Low-dose techniques have been applied to both helical CT and high-resolution CT (HRCT). Results Plain radiographs/CR remain the fist most common thoracic imaging study. Computed tomography (CT) is the primary crosssectional imaging modality used to evaluate all thoracic components due to its increased sensitivity and specificity compared to chest radiography. CT may be used either to better evaluate radiographic abnormalities or to assess the presence and extent of a suspected systemic disease. HRCT is the method of choice for the evaluation of diffuse parenchymal disease. Evaluation of the mediastinum and chest wall should be performed with helical CT. MRI is better in evaluating the chest wall or in demonstrating soft tissue inflammation and rib bone marrow changes compared to CT. Nuclear medicine can add functional information to the morphological information provided by CT and MRI.The systemic diseases in children includes the connective tissue diseases, immunodeficiency and immunodeficiency syndromes, chronic granulomatous disease, Langerhans´s cell histiocitosis, cystic fibrosis, immotile cilia syndrome, vasculitis, etc. Conclusion Chest radiograph underestimates the detection and extent of lung disease in systemic diseases. HRCT detect, characterize and determine the extent of the interstitial and alveolar disease. Early recognition of disease will lead to prompt treatment that can be beneficial in preventing and improving progression of the disease. P12 Persistent left superior vena cava draining into left atrium with tracheal stenosis in a newborn baby: CT findings Hiroko Hara, Eriko Shimada, Yoshihiro Minosaki, Masato Nishioka, Kikuko Oku Kawaguchi Municipal Medical Center Background Persistent left superior vena cava (PLSVC) draining into the left atrium (LA) with absent right superior vena cava (SVC) is a extremely rare congenital systemic venous anomaly. This venous anomaly with associated tracheal stenosis diagnosed by CT in a newborn has not been published in the literature. Objective To describe CT findings of a rare venous anomaly and tracheal stenosis in a newborn baby. Materials and methods A baby boy was born at the gestational age of 39 weeks and 1 day weighing 3,104 g. He was presented with mild grunting soon after birth. The peripheral oxygen saturation (SpO2) was 84–93%, despite oxygen administration through nasal cannulae. He was mildly cyanotic, however tachypnea and retraction were not observed. Echocardiography revealed PLSVC, atrial septal defect or

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persistent foramen ovale. No other cardiac anomaly could be obtained. No abnormal findings were demonstrated on chest radiograph. However SpO2 did not improve. For this unexplained hypoxemia, chest CT was performed on day 7. Results Enhanced CT showed PLSVC draining into LA. Right SVC was absent. This venous anomaly leads to right-to-left shunt, and accounts for hypoxemia. Contrast echocardiography confirmed this anomaly. He underwent surgical treatment which was successful. At the age of nine months, recurrent stridor occurred. Tracheal stenosis was revealed on CT. Conclusion We report the newborn baby with PLSVC draining into LA with absent right SVC and associated tracheal stenosis diagnosed by enhanced CT. CT clearly demonstrated this rare congenital systemic venous anomaly, and was very useful in the initial evaluation of unexplained hypoxemia. P13 Prenatal and postnatal assessment of VACTERL association radiographics findings Marianna Tagliabue, Dorothy Bulas, Rhonda Schonberg, Kenneth Rosenbaum Ospedale S Gerardo, Monza, Italy, Children National Medical Center, Washington DC, USA Background VACTERL is an acronym describing the concurrence of specific, nonrandom congenital anomalies of unknown etiology including Vertebral, Anal atresia, Cardiac, Tracheo-Esophageal fistula, Renal and Limb anomalies. The diagnosis may be difficult to establish with numerous associated anomalies that can resemble or overlap other pathologic conditions. Some anomalies may be too subtle to recognize prenatally. Successful postnatal radiologic assessment requires an understanding of the complexities of these various anomalies. Objective In light of the numerous anomalies and variable prognosis of VACTERL association, timely and accurate diagnosis for appropriate management and follow-up is important. The prenatal and postnatal radiologic evaluation of VACTERL association will be presented. Materials and methods Retrospective review of prenatal and postnatal imaging findings in patients with VACTERL association from January 1998 July 2008 was performed. Prenatal evaluation by US and MRI as well as postnatal evaluation by X-ray, fluoroscopy, CT, US, MRI and nuclear medicine was reviewed. Results Prenatal US was particularly useful in the assessment of cardiac, renal, cleft lip and skeletal anomalies. Fetal MRI was helpful at times for the assessment of anal atresia, cranial anomalies and pulmonary agenesis. Both modalities were useful in diagnosing 2 vessel cord and duodenal atresia. Both MRI and US were limited in the assessment of TE fistula, tethered cord and some vertebral anomalies prenatally. Postnatal radiologic evaluation included a combination of X-rays for limb, spine and bowel anomalies. Fluoroscopy was important for the assessment of TE fistula repairs, recto-vesico/urethral fistulas and renal anomalies. Radionuclide scans and US were useful for assessing renal anomalies. CT and MR were useful to evaluate pulmonary agenesis, tethered cord, vertebral anomalies, as well as urogenital and anal malformations. Conclusion Understanding the complex and, at times, subtle anomalies associated with VACTERL association allows for improved prenatal diagnosis and appropriate postnatal radiologic evaluation.

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P14 Magnetic resonance imaging (MRI) in the prenatal diagnostics of pulmonary pathologies Agnieszka Duczkowska, Marek Duczkowski, Monika BekiesinskaFigatowska, Anna Romaniuk-Doroszewska, Hanna Bragoszewska, Renata Jaczynska Institute of Mother and Child, Warsaw, Poland Background Prenatal MRI is of special importance in supplementary diagnostics of systems difficult to approach with sonography, such as the lungs, vertebral canal or the brain. Objective The purpose of this study is a quantitative and qualitative assessment of fetal lung disorders on MRI. Materials and methods 253 pregnant women between 17 and 41 years of age (15–39 weeks gestation) underwent MRI with 1,5 T units (GE SIGNA, Marconi Eclipse). SSFSE sequences and T2-weighted images in axial, coronal and sagittal planes have been used. Three to 5 mm section thickness was applied. Optionally additional sequences have been performed. Results Out of 261 fetuses examined 31 (12%) revealed lung abnormalities. Nine (29,0%) of them had pulmonary hypoplasia diagnosed, 8 (25,8%) left-sided congenital diaphragmatic hernia, 1 (3,2%) right-sided congenital diaphragmatic hernia, 7 (22,6%) congenital cystic adenomatoid malformation, 2 (6,5%) pulmonary sequestration and 3 (9,7%) other disorders. In 1 case (3,2%) no pulmonary lesion was described, although in the previous exam of the same fetus pulmonary sequestration was suspected. In all cases chest pathology has been first suspected on sonography. MRI additionally gave an opportunity to distinguish between congenital diaphragmatic hernia and congenital cystic adenomatoid malformation, revealed the hernia contents in the thorax and detected the site and extension of cystic lesions. Conclusion MRI offers an added diagnostic and prognostic value to the standard prenatal sonography also in the diagnostics of fetal lung pathologies. P15 MRI measurements of the fetal brain Alexia M Egloff, Hayder Hashim, Gilbert Vezina, Dorothy Bulas Children’s National Medical Center Background MRI has been proven useful in the evaluation of the fetal CNS with improved anatomic detail compared to US. Knowledge of the normal appearance and measurements of the fetal brain are fundamental for the evaluation of these studies and helpful identifying SUBTLE abnormalities. Objective The objective of our study is to provide measurements of various CNS structures at different gestational ages as an aid in the evaluation of the fetal brain. Materials and methods A total of 672 prenatal MRI studies were performed in our Institution between 1999 and December 2008. A retrospective evaluation of the studies that were digitally available was performed. From the MRI examinations available, we excluded studies with CNS abnormalities, multiple pregnancies, aneuploidy or specific syndromes.

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Over 200 MRI studies were included in our study. Measurements in axial, coronal and sagittal planes were obtained, including the fronto-occipital diameter, cerebral and bone biparietal diameter, interhemispheric distance, length of the corpus callosum, height and anteroposterior diameter of the vermis, transverse cerebellar diameter, anteroposterior and craniocaudal interopercular distance, atrial diameter, biatrial diameter, thickness of the choroid plexus, lateral diameter of the third ventricle, anteroposterior diameter of the fourth ventricle. Results Data was collated and analyzed and different ratios were evaluated. Comparison with previously published data was performed to increase statistical significance. Results are presented in a poster format. Conclusion MRI examinations are frequently performed in the evaluation of the fetus. Knowledge of normal cranial measurements and characteristics of the developing central nervous system at various gestational ages is useful in the MRI evaluation of the fetal brain. P16 Prenatal diagnosis of a nasal glioma C Cellier, G Labadie, M Brasseur-Daudruy, V Grzecoryczyk, D Dehesdin Rouen University Hospital Background Congenital midline nasal masses are rare, especially glioma. Objective The differential diagnosis of foetal paranasal facial masses are discussed. Materials and methods We report a case of foetal nasal glioma diagnosed at 21 weeks of gestation. The glioma appeared as a hypoechoic mass, showing no internal vascularisation on the first ultrasound exam. At 35 weeks of gestation, the mass appeared slightly vascular. A foetal MRI excluded the possibility of an encephalocele by showing the absence of bone defect. At birth, the mass was adherent to deep plane and covered with telangiectatic skin. A Colour Doppler indicated a solid, well circumscribed hypoechoic mass with a flow pattern atypical of haemangioma. The Doppler spectrum showed arterial flow characterised by low-flow velocity. A MRI confirmed the absence of intracranial connections of the tumor, which appeared less hypervascular than haemangioma on post contrast sequences. The tumor was completely resected at the age of 5 months, via an extranasal approach. The histopathological diagnosis was nasal glioma. Conclusion US with Doppler analysis and MRI are fundamental to differentiate nasal glioma from encephalocele and haemangioma, and to plan the correct surgical approach. P17 Fetal imaging of abdominal wall defects Preeyacha Pacharn, Maria A Calvo-Garcia, Leann E Linam, Eva I Rubio, Beth Kline-Fath Cincinnati Children’s Hospital, Cincinnati, USA Congenital anterior abdominal wall defects are resulting from in utero developmental abnormality. The correct prenatal diagnosis is important. It can lead to proper parental counseling and management.

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Gastroschisis is a paraumbilical abdominal wall defect with evisceration of abdominal content into the amniotic cavity. The defect involves full thickness of the abdominal wall with no membrane. Freefloating bowel loops can be identified within the amniotic fluid. Omphalocele is a midline anterior abdominal wall defect with herniation of abdominal viscera into the base of the umbilical cord. The eviscerated organs are separated from amniotic fluid by a membrane. Pentalogy of Cantrell is a rare anomaly. The complete syndrome is characterized by two major defects: ectopia cordis and abdominal wall defect (usually omphalocele). Other three defects include disruption of the distal sternum, anterior diaphragm and diaphragmatic pericardium. Limb-Body wall complex involves a variable group of congenital limb and body wall defects of the chest and abdomen. Abnormalities usually include a large ventral wall defect, lower limb rotational anomalies and scoliosis. Amniotic band syndrome consists of defects that occur secondary to amniotic sac rupture. It may affect limb, face and sometimes associate with ventral wall abnormality. Cloacal and bladder exstrophy are also uncommon. Cloacal exstrophy involves the retraction of the cloacal membrane and incomplete descent of the urorectal septum. Bladder exstrophy is caused by inappropriate retraction of the cloacal membrane with eversion of bladder mucosa. The combination of omphalocele, exstrophy of bladder, imperforated anus and spinal deformities has been called the OEIS complex. The final outcome of these defects is significantly affected by the presence of additional structural and/or chromosomal abnormalities. The purpose of this illustration is to demonstrate the spectrum of findings of congenital abdominal wall defects diagnosed with prenatal MRI in correlation with postnatal findings. P18 Imaging evaluation for acute pain in the right lower quadrant: Pictorial essay Shigeko Kuwashima Dokkyo Medical University Background Acute appendicitis is the most common cause of acute pain in the right lower quadrant (RLQ) and urgent surgical treatment of choice for disease. However, many various disease and complication of acute appendicitis cause the same clinical and laboratory findings in urgent room. US are the primary imaging modality for assessment of acute RLQ pain. CT is valuable, especially for confirming the extent and nature of the complication of acute appendicitis. MRI or MRU is helpful in renal disease when more detailed diagnostic information is required for treatment planning. Successful imaging with all modalities requires familiarity with both the characteristic and the unusual features of a wide variety of pathologic conditions. Objective To assess the findings of disease from RLQ pain Materials and methods Patients (from 4 to 16 years) were retrospective evaluated for radiological imaging between 2000 and 2008. Radiological findings were compared to pathologic diagnosis, surgical findings, and clinical findings. Results The disease included acute appendicitis, torsion of ovarian teratoma, seminoma of undiscerning testis, pelvic abscess caused

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from complication of appendicitis or Chlamydia infection, intussusception due to lymphoma, typhlitis, chrohn disase, paniculitis, hyperplasia of lymphoid follicles, hydronephrosis, post surgical hematoma with pleural effusion, and foreign body. Conclusion The spectrum of conditions that may manifest as acute RLQ pain was shown with emphasis on the most appropriate and effective imaging investigation. Noninvasive determination of the explanation for the patients symptomatology is the expected standard so that surgical intervention can be promptly selected.

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Materials and methods Images where obtained from Bowel MR studies performed at BC Children’s Hospital in Vancouver and Princess Margaret’s Hospital in Perth. Results TSE T2 sequences in 3 planes and fat saturated T1 sequences pre and post gadolinium provide excellent information. Conclusion Our poster illustrations should review necessary anatomy and illustrate pathology allowing better delineation and classification of perineal complications of Crohn’s disease. This information is much sought after by attending physicians and surgeons.

P19 P21 Abdominopelvic cystic lesions in childhood: Radiological features Mehmet Atalar1, Hulusi Egilmez1, Cesur Gumus1, Levent Cankorkmaz2 1. Department of Radiology, School of Medicine, Cumhuriyet University, Sivas, Turkey 2. Department of Pediatric Surgery, School of Medicine, Cumhuriyet University, Sivas, Turkey Background Pediatric cystic abdominopelvic masses can be of many origins. Consideration of age, location and imaging findings aids in the differential diagnosis. Objective To illustrate the radiological features of different types of abdominopelvic cystic and cyst-like lesions. Materials and methods A retrospective review was performed in child patients with abdominopelvic cystic lesions. All cases confirmed by surgical resection, biopsy, or radiological follow-up study. Results A variety of radiological features were identified in various abdominopelvic cystic lesions. The disease entities include pyloric atresia, duodenal atresia, mesenchymal hamartoma, choledochal cyst, splenic pseudocyst, pancreatic pseudocyst, hydronephrosis, adrenal hemorrhage, mesenteric and omental cysts, gastrointestinal duplication cyst, ovarian cysts and cystic neoplasms, hematocolpos, urinary hydrocolpos, pyocolpos, urachal abscess, appendiceal abscess, intraabdominal and sacrococcygeal teratomas, intraabdominal hydatid cysts and CSF pseudocyst. Conclusion Knowledge of radiological features of various abdominopelvic cystic lesions may be helpful for differential diagnosis. P20 MR imaging of perineal Crohn’s disease D Jamieson1, P Shipman2 B C Children’s Hospital, Vancouver, Canada1, Princess Margaret Hospital, Perth, Australia2 Background Knowledge of pelvic muscle and sphincter anatomy is required to adequately delineate sinus tracts, fistula and abscess development in perineal complications of inflammatory bowel disease. MR imaging can elegantly show pelvic anatomy and pathology providing excellent information to guide management of these difficult complications. Objective Use MR images to illustrate perineal anatomy of levator anni muscle, puborectalis muscle and and the internal and external anal sphincters. Demonstrate the course of fistula tracts and abscess collections, in particular transgression of muscle and sphincters.

MRI of fetal intestinal atresia Shigeko Kuwashima, Yasushi Kaji Dokkyo Medical University Background Prenatal diagnosis of intestinal atresia has been proved to have an impact on postnatal outcome (better planning of the delivery, surgical requirement). Such diagnosis is based on sonographic screening. MRI, however, can provide more accurate findings including dilated bowel signal intensity and the demonstration of the bowel distal to the atresia. Objective To assess the findings of fetal MRI for evaluating the level of intestinal atresia. Materials and methods The subjects comprised 24 fetuses (18– 36 weeks? gestation), including esophageal atresia (n=12), gastric obstruction (n=1),duodenal atresia (n=9), jejunal atresia (n=2), leal atresia (n=1). Nine of the fetuses with esophageal atreis had multiple anomalies including other parts of the intestinal anomalies. After obtaining informed consent, the pregnant women underwent MRI, which was performed with a 1.5-T super conductive unit (Siemens Magnetom Vision or Symphony) using a phased-array coil. No premedicaion was given for the examinations. Half-Fourier singleshot turbo spin-echo, T2-weighted (T2-W) sequences and T1weighted (T1-W) fast gradient-echo sequences.T2-W and T1-W sequences were performed in sagittal, coronal, and often axial plans. Imagings were reviewed by a pediatric radiologist. The MR findings and suggested diagnoses were compared with the results of neonatal evaluation( clinical history, imaging data, intraoperative constitution, and pathologic examination). Results Esophageal atreisa type A and duodenal atreia were easy to diagnose. However MRI provided complete diagnosis of small bowel atresia, and identified the level of obstruction in 50% of cases. In multiple level of bowel atresia, only one level of obstruction was indentifined in this study. Conclusion MRI is useful for the diagnosis of intestinal atresia in fetuses. Recognition of the bowel distal to the atresia is an important diagnostic finding especially in small bowel atresia. At present, it is difficult to prenatally diagnose esophageal atresia type C. P22 Pictorial review of choledochal cysts in children N Barmpaliou, S Kaiser Department of Pediatric Radiology, Karolinska University Hospital, Sweden

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Background Choledochal cysts are congenital anomalies of the bile ducts. They consist of cystic dilatations of the extrahepatic biliary tree, intrahepatic biliary radicles, or both. The classification system for choledochal cysts currently includes 5 major types (Todani et al, 1977). Associated anomalies of the pancreatic duct, its junction with the common bile duct, and the long common channel formed by the two are common. Different imaging modalities have been used in preoperative investigation. The preferred techniques are US and MRI (MRCP) because they are non-invasive and do not use ionizing radiation. Objective The aim of the study was to review the preoperative imaging with different modalities in different choledochal cyst types. Materials and methods The literature has been reviewed for old and new classifications. A retrospective review of patients imaged with different modern techniques at our hospital was performed. The preoperative imaging findings were correlated to surgery. Results 32 children with choledochal cysts were identified. The most common types were type I and IV, visualised mainly by MRI. In one case type II was identified by surgery. In many of the older cases, before MRI was used on the routine basis, the type was not specified. The different types are demonstrated in a pictorial review, predominantly using MRI. Conclusion US is the best initial method of evaluating dilatation of the intra- and extrahepatic biliary tree while MRCP defines the anatomic characteristics of the malformation in detail without potential complications. High correlation observed between imaging findings from MRCP and surgical findings make MRCP the method of choice for the preoperative assessment of choledochal cysts and also suitable for reevaluation of the post operative follow-up. P23 Hepatic migration of an ingested sewing needle Serhat Avcu, Ozkan Unal, Ozkan Ozen, Aydın Bora Department of Radiology, Yuzuncu Yil University, Van, Turkey Background Although foreign body ingestion is considered more frequently in children, it can be seen in all age groups. Objective The migration of an ingested foreign body into solid organs such as liver or pancreas is rarely reported. The aim of this study is to emphasize the importance of radiological imaging in a 15 year old girl with a hepatic foreign body which is diagnosed incidentally. Materials and methods The patient is evaluated with direct roentgenogram, abdominal sonography and computed tomography (CT). Results A 15 year old girl applied to emergency room with complaint of abdominal pain. Although the patient history did not reveal any ingestion of foreign body, a lineer opacity compatible with a sewing needle in right hypochondrium was observed on upright direct roentgenogram. On abdominal sonography, a lineer echogenity (sewing needle) in segment 6 of the liver was visualised with surrounding parenchymal hypoechoic areas corresponding to inflammatory changes. On following CT scan, the diagnosis of sewing needle and surrounding foci of abscesses were confirmed. Conclusion The migration of an ingested foreign body into the liver by perforating the small bowel is a rare situation. It should be kept in mind,

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as in our case, pediatric patients may be aware of foreign body ingestion. In such cases, the only way of diagnosis may be radiological imaging such as roentgenogram, abdominal sonography, or CT. P24 Factors impact on the success of delayed, repeated air enema for intussusceptions in children Xinyu Yuan, Fengsen Bai Capital Institute of Pediatrics, China Background It is usually a challenge for pediatric radiologists and clinicians to decide wether the patients with intussusceptions should be performed repeated air reduction or get operation directly after they were failed in the first air enema. Objective Our purpose was to assess our current air enema successful rate and to focus on finding the factors that would impact on the success of delayed, repeated air reduction for intussusceptions in children. Materials and methods We performed a retrospective analysis of all intussusception cases seen at the Capital Institute of Pediatrics, Beijing, China, a tertiary pediatric hospital, from December 2007 to October 2008. Results 343 children with intussusceptions were involved in our study and all of them were performed air enema initially. Reduction rate with first air enema was 80.76% (227/343). Delayed reduction attempts were used in 49 patients (14.29%) and were successful in 61.22% (30/49). Total reduction rate was 89.5%. Furthermore, the clinical and radiological data of different group, with success of delayed attempts and failure of delayed attempts, were compared statistically. There were significant differences between the two groups in the presence of obstruction of the small intestine on plain films (P=0.049, <0.05), the initial position of the apex of the intussusception (P=0.023, <0.05), the position of the apex of intussusception at the end of first air reduction (P= 0.003, <0.01) and the position of the apex of intussusception when the pressure was released after the first reduction (P=0.005, <0.01). Conclusion Air enema associated with the use of delayed, repeated reduction attempts is an effective approach for intussusception reduction with high successful rate. Delayed, repeated reduction attempts should be considered when the intussusceptum had great activity and there was no evidence of the small intestine obstruction on plain film initially. P25 Crohn’s disease in children—A pictorial review using a multi-modality imaging approach Kj Au-Yong, E Fanou, A Pigott, S Vessal, D Bakanilova University Hospital of North Staffordshire, UK Background Both ulcerative colitis and Crohn’s disease are relatively uncommon in children. In a group of approximately 100,000 children age 15 years or younger, it is estimated that approximately 2 or 3 of them will develop Crohn’s disease each year. But complications secondary to Crohn’s disease are more frequent.

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Objective To demonstrate the role of imaging in the diagnosis of Crohn’s disease and its complications using a multi-modality imaging approach. Materials and methods We will provide a pictorial spectrum of signs and complications secondary to Crohn’s disease using plain radiography, ultrasound, barium studies, white cell scan, MDCT and MRI. We will also use MRI enterography with high quality multiplanar reformats and post processing images to illustrate some of the more complex cases. Results US has a 87% sensitivity in detecting abnormal bowel pattern in children and should be the first imaging investigation in children suspected with having inflammatory bowel disease. Although double contrast upper and lower GI studies have long been the standard in the evaluation of IBD, MR imaging is increasingly used to help identify and characterize pathologically altered bowel segments as well as extraluminal lesions Conclusion The radiologist should be familiar with the use of multiple imaging modalities in the investigation and diagnosis of Crohn’s disease in children and young adults to help to ensure correct diagnosis and appropriate treatment.. P26 Choledochal cysts in children Fátima Pires, Sónia Palma, Dulce Antunes, Luísa Lobo, Miroslava Goncalves, José Fonseca-Santos Hospital de Santa Maria Background Choledochal cysts are rare congenital anomalies, consisting in cystic or fusiform dilatation of the extra-hepatic and / or intra-hepatic biliary tree. Most of the lesions (80%) are diagnosed in infancy or childhood and in only one third of the cases the classic triad of symptoms of right upper quadrant pain, abdominal mass and jaundice is present. Possible complications include lithiasic, inflammatory and neoplasic changes of the biliary tree. Surgery is the treatment of choice in almost all cases. Objective 1. To describe imaging features of congenital biliary cystic disease in children. 2. To outline main differential diagnostic pitfalls. 3. To emphasise the role of imaging evaluation in diagnostic and follow up orientation. Materials and methods An overview of imaging findings of choledochal cysts is presented among selected cases studied in our department. Ultrasound plays a major role, remaining the screening examination for evaluating the biliary tract. Documenting a communication between the cyst and the biliary tree can establish the diagnosis. Further evaluation can be accomplished with Magnetic Resonance Cholangiopancreatography, a non-invasive and non-irradiating technique which is able to define the presence of the cyst, to identify its type according to the Todani’s classification and to evaluate possible associated complications, allowing for adequate surgical planning. Conclusion Choledochal cysts are rare. Prompt diagnosis and surgery are needed to prevent complications. Radiologists play a major role in diagnosis, surgical planning and long term follow-up due to the possibility of carcinoma developing in the intra-hepatic ducts, even after successful surgery.

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P27 Imaging in pediatric short bowel syndrome: A pictorial essay Kamaldine Oudjhane, Jorge Davila, Jeffrey Traubici Hospital for Sick Children, University of Toronto Background Short bowel syndrome is a malabsorptive state secondary to congenital anomaly or surgical resection of a significant segment of the small intestine. It bears potential for life-threatening complications, especially the parenteral nutrition-related ones. Medical management and surgical strategies for improved absorption are key factors for survival Objective To illustrate through a pictorial essay the contribution of imaging in the medical /surgical management of short bowel syndrome. Materials and methods Cases from radiology database of short bowel syndrome were reviewed from our institution during the last 8 years. Major characteristics and complications during therapy of this clinical entity are depicted through imaging features from different modalities. Results Sonography is performant in the diagnosis of complications related to parenteral nutrition including venous catheter problems or severe liver disease (steatosis, cholestasis, cirrhosis). Infectious risk is assessed best with conventional radiographs as well as cross sectional methods (US, CT). Contrast opacifications of the gastrointestinal tract (conventional as well as loopograms) are helpful in delineating the surgical anatomy of the G I tract following enteral feeding techniques ,intestinal stomies, small bowel lengthening and serial transverse enteroplasty (STEP) procedures. Conclusion The nature and length of remaining post-surgical anatomy of the small intestine condition the occurrence of complications (bowel dysmotility, malabsorption , bacterial overgrowth). The different imaging modalities can assist in the diagnosis, monitoring and management of short bowel syndrome. P28 Imaging findings in rare case of forme frusta choledochal cyst P Pavicevic, V Perisic, A Sretenovic, D Zivanovic, V Vukadinovic University Childrens Hospital Belgrade Background Forme fruste choledochal cyst(FFCC) is a variant of choledochal cyst assosiated with mild or no dilatation of the extrahepatic bileduct (EHBD).Pancreatico-biliary malunion (PBMU) was found to coexist with FFCC.These rare type of anomaly in infants and children may lead to the development of malignancy of the bile duct in later life. Objective The aim of these study was to present a case of these rare condition and to show imaging findings of echosonography, CT and intraoperative cholangiography. Materials and method we are presenting a case of a 17 month-old female,with reccurent abdominal pain, fever assosiated with elevated serum liver laboratory findings as presenting syptoms. Results Echosonography which was several time repeted showed mild variabile dilatation of the extrahepatic biliary duct ( EHPD)of 6– 8 mm.Longitudinal sonograms revealed in EHBD intraluminal hiperechoic ring like formation which suggested PBMU. CT and intraopeartive cholangiography confirmed the diagnosis of long common pancreatico-biliary duct, with mild dilatation of extra and intrahepatic BD .The common bile duct and gallbladder were

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remowed. A hepaticojejunostomy was established with Roux-en -Y reconstruction., and HP of the exiced EHBD showed chronic inlammation, with similar findings of the gallbladder. The follow up period of 8 months was asymptomatic Conclusion Mild dilatation of EHBD(6–8 mm) on echosonography should be the leading point to the correct diagnosis of forme fruste choledochal cyst.It is important to establish the diagnosis on time, and to treate the pediatric patients surgicaly as soon as the diagnosis is made,because surgical treatment relieves symptoms and minimazes the risk of malignancy later in life. P29 Inflammatory pseudotumor of the liver in a child: Imaging findings P Galina, E Koskina, C Farkoni, P Karra, G Koronaios, M Zarifi “Agia Sofıa” Children Hospital, Athens, Greece Background Inflammatory pseudotumor of the liver is a rare lesion of childhood. The radiographic appearance varies and it is difficult to make a specific diagnosis. The lesion is considered benign; but may have a fatal outcome. Objective We present the imaging findings of an inflammatory pseudotumor of the liver. Materials and methods A 7 year old boy was admitted to our hospital with a history of 2,5 year recurrent fever, every 20–30 days, of short duration 3–4 days, and with no other symptoms. During the episodes mild anemia and neutropenia were also identified. The child was referred to our depertment for sonographic evaluation of liver enlargement. Results The left liver lobe was diffusely hypoechogenic with textural disorganization and scattered microcalcifications. Intense hyperechogenic areas in the subphrenic liver surface and around the gallbladder were shown, as in fibrosis.The right lobe was enlarged with normal architecture. The left portal vein had small diameter with small vessels distally, as in cavernous transformation, possibly due to previous thrombosis. The CT scan and the abdominal MRI revealed the same findings in regard with the portal vein and moreover, multiple solid lesions along the subphrenic surface of the left liver lobe with imaging characteristics of lymph nodes. Inflammation was considered the most possible diagnosis, although the specific etiology could not be suggested. Laparotomy and microscopic examination that followed verified the inflammatory nature of the lesion. Conclusion Based on our experience with this child and according to the literature, the imaging findings of inflammatory pseudotumor are no specific and histologic examination after percutaneous biopsy or surgical procedure is necessary. However in our case the distribution of lesion, the findings of fibrosis and the absence of vessels infiltration were indicative of inflammation than tumor. P30 Imaging of early and late complications in pediatric orthotopic liver transplantation: A pictorial review Hassan Douis, Christophoros Nicolaou, Khalid Sharif, Helen Alton Birmingham Children’s Hospital, Birmingham, UK

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Background Orthotopic liver transplantation is the treatment of choice in children with severe acute or chronic liver failure, for which no other therapy is available. Liver transplantation is however associated with a wide range of complications including vascular, biliary, hepatic parenchymal complications and other conditions such as lymphoproliferative disorders. Objective In this pictorial review, we describe and illustrate the spectrum of these early and late complications of pediatric liver transplantation with a particular emphasis on the advantages and disadvantages of the different imaging modalities in the diagnosis of these complications. Materials and methods The pediatric liver transplantation database in our hospital was searched for all patients with complications after liver transplantation over a period of 7 years. Selected images of early and late complications of pediatric liver transplantation were retrieved from the electronic picture archiving and communications system (PACS). Results and conclusion Liver transplantation is the treatment of choice in pediatric patients with end-stage liver disease. Although liver transplantation in children is well established it is associated with significant complications, particularly vascular complications that may lead to graft failure unless prompt treatment is instituted. It is therefore essential for the pediatric radiologist to be familiar with the spectrum of early and late complications that can occur after liver transplantation and to be aware of their typical imaging characteristics. P31 Plain abdominal radiography and abdominal US in evaluation of necrotising enterocolitis TH Koronaios, P Karra, P Galina, T Georgiou, P Autia, S Dara, F Anatolitou, M Zarifi “Agia Sofia” Children’s Hospital of Athens, Greece Background Necrotizing enterocolitis is an acquired inflammatory disease of the gastrointestinal tract, secondary to a complex interaction of multiple factors, notably prematurity. Its a common acute abdominal condition in the neonatal period that results in mucosal damage, leading to intestinal ischemia and necrosis. Objective The purpose of this study is to review the role of plain abdominal radiography and sonography in the evaluation of NEC. Materials and methods From January 2008 to June 2008, 14 neonates (eight girls and six boys) were diagnosed with NEC in the neonatal intensive care of our hospital. Five of them were premature and nine were fullterm babies. Eleven were delivered with ceasarectomy and three with normal delivery. The symptoms were abdominal distention and bloody stools. Plain abdominal radiography was performed in all patients and sonography in four of them. The timing of follow up plain abdominal radiographs and abdominal US depended of the severity of NEC. Results Plain abdominal radiography revealed bowel distension with intramural air in 8 neonates, in 1 bowel distension with intramural air and air in the portal vein. In 5 neonates the abdominal radiography was normal. Bowel wall thickness was established with sonography in 2 neonates, portal vein gas and intramural air in 1 and in 1 portal vein gas, intramural air, bowel wall thickening and intraperitoneal fluid. Plain abdominal radiography was performed before the

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sonography. When plain abdominal radiography was abdnormal, US was abnormal as well. Conclusion Plain Abdominal radiography is the imaging modality of choice for the assessment of NEC, while abdominal US provides direct images of the abdominal structures, particularly the bowel and the presence of fluid in the peritoneal cavity. In these series portal vein gas and intramular air did not always proved to be ominous signs as some of the neonates with these signs were treated conservatively and had a favourable outcome. P32 Neonatal bowel obstruction secondary to gastrointestinal duplication cysts: Report of four cases S Franchi Abella, MG Papadaki, M Al-Issa, B Husson, D Pariente Department of Pediatric Radiology, Le Kremlin Bicetre-France Background Gastrointestinal duplication cysts (GDC) are a rare cause of bowel obstruction in neonatal period. Objective The aim of this study is to present, four neonates with bowel obstruction (BO) caused by GDC, to emphasize on imaging findings in different diagnostic procedures and to highlight on the role of ultrasonography (US). Materials and methods The study includes four neonates with clinical symptoms of BO. In all cases diagnostic work-up started with plain abdominal films. In two patients a barium enema (BE) was performed, one of them also underwent a barium meal (BM) examination. US with high frequency convex and linear transducers was performed in all cases. Results In all patients plain film indicated that an obstruction was at the proximity of the ileocecal junction. The BE in one patient confirmed the level of the obstruction while being inconclusive in the second. This patient underwent a BM that indicated an obstruction at the ileocecal junction. In all patients US revealed well defined, unilocular cystic lesions, measuring from 1,5 to 5 cm, with an anechoic content (3/4) or containing echogenic material (1/4). They were all located in the right lower abdomen. Their wall was evaluated; three layers were identified in one patient, two layers in two cases while one presented a thickened, without distinct layers, wall. Associated findings included ileum wall thickening proximal to the lesion (1/4).The diagnosis of GDC was evocated in all cases and confirmed at surgery. Conclusion GDCs may cause BO in neonatal period. US confirms the diagnosis of BO and can show the level and the cause of obstruction. A cystic nature and a distinct layer wall are highly suggestive of GDC, however, final diagnosis is always pending on microscopic features. Barium studies are probably unnecessary and should be reserved for selected cases. P33 Nutcracker phenomenon: Two cases Demet Unal, Gokhan Gokalp, Nigar Varlıbas, Zeynep Yazici Radiology, Medical Faculty, Uludag University, Bursa, Turkey Background Nutcracker phenomenon is defined as compression of the left renal vein between abdominal aorta and superior mesenteric

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artery (SMA). It is an uncommon event and the underlying cause is not yet known. While this phenomenon frequently presents as an asymptomatic condition, it may cause abdominal pain, proteinuria, hematuria, or flank pain. Objective Evaluation of nutcracker phenomenon based on Doppler US and magnetic resonance angiography (MRA) findings of 2 cases. Nutcracker phenomenon is diagnosed by radiologic results and laboratory tests eliminating the hematuria causes. The angle between abdominal aorta and SMA is less than 90° and consequently left renal vein is entrapped and compressed between those 2 structures. Beyond the compression level, left renal vein shows dilatation. In this condition, compressed left renal vein may cause renal venous hypertension followed by left ureteral and gonadal varices. Materials and methods The two cases, 7 and 16 year-old, were presented with left flank pain. There was no clinical indication of urinary tract infection. Proteinuria and microscopic hematuria were detected in the urinalysis. CBC, erythrocyte sedimentation rate, Creactive protein, coagulation profile, and selective urine cytology were normal. Renal US, renal Doppler US, and MRA studies were performed. Results Renal US revealed normal sized left kidney and distinct cortex-medulla boundary. No nephrocalcinosis was found. Doppler US and MRA studies showed superior mesenteric artery as seperating from abdominal aorta by a considerably acute angle in both of the cases. Consequently, left renal vein was appearing to be compressed between abdominal aorta and superior mesenteric artery while demonstrating a dilatation after that point. Diagnosis was established based on the clinical, laboratory, and radiologic results. Conclusion Nutcracker phenomenon should be considered following elimination of other differential diagnoses in cases presenting with nonspecific abdominal pain alongside proteinuria and hematuria for which Doppler US and MRA provide supportive findings. P34 Choosing the right diagnostic method in gastroesophageal reflux disease? Are the pediatricians aware of the radiation exposure? Cigdem Uner, Secil Eksioglu, Yasemin Tasci Yildiz Dr Sami Ulus Cocuk Hastanesi, Ankara, Turkey Background In most patients gastroesophageal reflux disease (GERD) is a clinical diagnosis. Pediatricians require an objective test. Fluoroscophy and technetium sulfur colloid scintigraphy are some of the diagnostic imaging tests but the risk of exposure should be considered. Objective Learning which imaging method is superior in diagnosing GERD and increasing awareness of the radiation exposure. Materials and methods 123 pediatricians are inquired on radiation exposure during diagnostic tests for GERD. Results Of the 250 inquiry forms, 123 were answered. Conclusion 74% of the participants stated that the degree of radiation exposure is more during flouroscophic examinations than scintigraphic examinations. Eighty-six percent of the participants stated that scintigraphic examinations were superior in diagnosing the reflux disease. The ones who stated that the radiation exposure was equel in both methods were less than 0.1%

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P35 Evolution of renal cell carcinoma in a 16-year-old adolescent: CT findings Shin-Lin Shih, Yu-Peng Liu, Yi-Fang Chen, Fei-Shih Yang Department of Radiology, Mackay Memorial Hospital A 16-year-old man presented with painless hematuria. The physical examination and past history were non-contributory. CT scan of the abdomen revealed a 3; 3 cm high-attenuation mass in the lower pole of left kidney in precontrast images, which showed heterogeneous enhancement in postcontrast images. Biopsy of the lesion was taken, and the pathologic diagnosis was reactive atypia. Follow-up CT study 7 months later showed interval growth of the mass to 3.5; 3.5 cm with a tiny calcification and enlarged enhancing soft tissue part. Rebiopsy of the lesion was done and revealed interstitial fibrosis. Another follow-up CT scan was performed 15 months later and showed minimal enlargement of the mass to 3.6; 3.5 cm with stippled calcifications in the periphery and further enlargement of the irregularly enhancing soft tissue part as compared with last study. The pathologic diagnosis after partial left nephrectomy was type 2 papillary renal cell carcinoma. The patient was doing well 7 months after operation. We present the serial images to show the chronological evolution of the tumor on CT. P36 Typical ultrasonographic finding of the hydrocele of the canal of nuck Noh Hyuck Park2, Jong In Lee1, Chan Sup Park2, Myung Ho Rho2, Mi Sung Kim2, En Ja Lee2 1. Department of Surgery, College of Medicine, Myongji Hospital Kwandong University 2. Department of Radiology, College of Medicine, Myongji Hospital Kwandong University Background The hydrocele of the canal of Nuck is very rare condition in female. So its radiologic finding is rarely reported. Objective To introduce the characteristic ultrasonographic finding, named as gooseneck sign, of hydrocele of the canal of Nuck in pediatric patients Materials and methods 2 young childrens (22 months, 14 months old females. respectively) were presented with irreducible inguinal palpable mass. All two cases were located at the right side. Ultrasound of the right inguinal area was performed with a 5–12 Mhz linear array transducer.. Results An well circumscribed unilocular cystic mass with a waist and its tail directed cranially to the inguinal canal was revealed on ultrasound examination, showing the gooseneck appearance, in all cases. Conclusion This ultrasonographic typical finding is helpful to diagnose the hydrocele of the canal of Nuck that is rare disease in female. P37 A giant multicystic dysplastic kidney: Prenatal US and MRI findings Ibrahim Adaletli, Sebuh Kurugoglu, Onur Tutar, Riza Madazli, Cenk Buyukunal Istanbul University Cerrahpasa Medical School, Turkey

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Background The multicystic dysplastic kidney is a relatively common form of renal pathology. The multicystic dysplastic kidney can be unilateral, bilateral or segmental and probably results from atresia of the ureteral bud system during embryogenesis. We present the prenatal MRI and US findings of an atypical and giant multicystic dysplastic kidney. A 37-year-old woman, gravida 3, parity 2, underwent prenatal sonography examination at the 24 week’s gestation. The size, contour and texture of the right kidney were normal on sonography. However, on the left side, a giant multilocular and multiseptated cystic lesion was detected. The lesion occupied the left kidney location also extended up to the diaphragm in the cranial direction. No kidney parenchyma was observed inside the lesion. The initial interpretation of the perinatologist was multicystic dysplastic kidney. For these findings to be evaluated further and to be validated, prenatal MRI was performed at 25 week’s of gestation. The mother was in a supine position for the examination, and the images were acquired during maximal inspiration. The fetal urogenital system was examined in sagittal, transverse, and coronal orientations using a T2weighted sequence (HASTE; TR/TE, 1,380/103; field of view, 250 mm; slice thickness, 4 mm; matrix, 256×256; number of excitations, 1). In MR images, the left kidney could not be identified. A giant multilocular and multiseptated cystic lesion was detected on the left side.The size and contour of the right kidney was normal. MRI findings of the cystic mass suggested multicystic dysplastic kidney and cystic lymphangioma. There were no accompanying congenital anomalies. P38 Adrenal haemorrhage presenting as acute scrotal swelling in a neonate: A case report V Bolli, G Pieroni, C Lanza, L Amici, VC Noviello, G Fabrizzi Azienda Ospedaliero-Universitaria Ospedali Riuniti Background Neonatal adrenal hemorrhage occurs in 0.2% of newborns because of a birth trauma, hypoxia or spontaneously and may rarely present as scrotal hematoma. Objective We present a case report of newborn with right adrenal hemorrage presenting as left scrotal hematoma. Materials and methods A male born after 38 weeks gestation after normal first pregnancy and vaginal delivery in premature rupture of membranes (PROM), presented with edema, thickness and purplish discolouration of the left hemiscrotum; the testis was mobile and the right side scrotal skin normal. Results Ultrasonography (US) showed scrotal soft tissue edema and difficoult identification of the vascularization. For the clinical suspicion of testicular torsion was performed a left surgical exploration that excluded complicated hernia and testicular torsion but a large scrotal hematoma extending until the groin was found with blood within the spermatic cord and tunica vaginalis. Postoperative abdominal US showed a right suprarenal mass hemorrhage (39× 25 mm) without peritoneal or retroperitoneal blood collection. US 3months follow up (once a month) showed a gradual decresing of the adrenal hematoma. Conclusion Adrenal hemorrhage is generally associated with perinatal hypoxia but spontaneous occurrence is nor rare. The right side is more often involved. Clinical presentation is various, depending on

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the volume of blood coming out. If the blood goes down into the retroperitoneal space it can descend into the groin and presenting as a scrotal swelling. Although the adrenal hemmorrhage is a condition relatively common in newborn, only 20 cases with scrotal hematoma have been described so far and to our knowledge this is the first case with controlateral scrotal hematoma prentation. Adrenal haemorrhage should be considered as a possible cause of acute scrotal swelling in neonates. Ultrasonography assessment should be performed to examine the intra-abdominal organs especially the adrenal glands, to find out an adrenal hemmorrhage and avoid an unnecessary scrotal surgical exploration.

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albuginea was thick and hyperechogenic. After orchiectomia, histopathologic exam revealed ischemic necrosis and fibrosis, consistent with testicular torsion The second case was a 13-years-old male; he underwent US study two weeks after scrotal pain and swelling. First US study showed heterogenous epididymis and testis on the right side without focal mass. Repeated US scan two months after the symptoms showed hyperechogenic tunica albuginea suggesting fibrosis similar to first case Both cases were showing decreased testicular dimension and hyperechogenic, thick tunica albuginea resembling calcification. But the x-ray graphies did not confirm calcification.Tunica albuginea fibrosis and small testis can be a sequel of subclinic testicular torsion.

P39 P41 Ultrasound of cystic dysplasia of the testis in two boys Živa Zupančič, Senja Mali Brajovič, Bojan Tršinar University Medical Center Ljubljana, Slovenia Background In suspected testicular pathology of an enlarged testis accurate assessment by high-resolution ultrasound with flow Doppler (US) is essential. When a pathologic change of the testis is detected, it is important, if possible, to make a correct diagnosis in order to enable an appropriate treatment decision. Objective In children, testicular enlargement can be caused by cyctic dysplasia of the testis (CDT), a rare congenital condition. As CDT has a rather characteristic US appearance and can be diagnosed by US only, we decided to present US findings in two cases to help in recognising this entity, and to report on treatment decisions. Materials and methods Two boys, a 2-month-old infant and a 2-yearold boy, with slight unilateral testicular enlargement were investigated by high resolution US and with flow Doppler of the testes, and by abdominal US. Results In both boys, US of the affected testis demonstrated enlargement and pathologic testicular structure, in the infant located dorsally, occupying half of the testis, in the boy in the central region, occupying less than half of the testis. The pathologic structures were rather well defined and consisted of multiple, small, anechoic, cystic structures with lack of flow signal. The diagnosis was CDT in both boys. Abdominal US of the 2-year-boy revealed ipsilateral renal agenesis. The infant had surgery with partial resection of the testis; the diagnosis of CDT was conformed. For the older boy it was decided to do follow up by US only. Conclusion Testicular enlargement can be caused by CDT, a rare congenital condition, which can be associated with ipsilateral renal agenesis or dysplasia. It has a rather specific US appearance with no flow signal and can thus be correctly diagnosed by high resolution US with Doppler flow. The diagnosis enables a correct treatment decision. P40 Testicular fibrosis due to testicular torsion Mustafa Emi, Murat Kocaoglu, Inanc Guvenc, Cem Tayfun Gulhane Military Medical Faculty, Ankara, Turkey Background To present similar two cases of testicular fibrosis due to undiagnosed testicular torsion. The first case was a12-year-old male, who was referred to our sonography division for small testis suspicious. In ultrasound(US) left testis was small and tunica

Testicular microlithiasis in children: Role of imaging and literature review Paolo MS Schingo, Cinzia Orazi, Antonio Spagnoli, Fabio Ferro, Massimiliano Silveri Bambino Gesù Childrens’ Hospital Rome Italy Background In the pediatric age group testicular microlithiasis is a rare disease, characterized by diffuse, intratesticular non-shadowing echogenic small foci. It mostly represents an incidental finding during routine scrotal sonography, but it can be associated with several conditions, such as cryptorchidism, gonadal dysgenesis and alveolar microlithiasis. The coexistence of testicular germ cell tumors and the occurrence of malignant processes have raised the suspicion of being a premalignant lesion in adults. Objective To assess the typical sonographic appearance of this condition and its significance. Materials and methods Between 2001 and 2008 we detected testicular microlithiasis in 20 patients, ranging from 18 months to 18 years of age (average 9 years). The patients were followed up annually. Results The actual cause of testicular microlithiasis is still unknown. It is believed to result from multiple calcium microprecipitates inside the seminiferous tubules. We found the typical sonographic pattern with variably extending multiple parenchymal non-shadowing echogenic small foci, evenly distributed or in peripheral clusters. Sonographic follow-up did not put into evidence the onset of neoplasms in our series. Also tumoral markers (CEA, beta HCG, alfa-feto protein) were within normal ranges. Conclusion Testicular microlithiasis, variably involving the parenchyma, can easily be recognized on US examination. Although no tumoral lesions have been detected in our pediatric series, in accordance with literature data, some aspects still need further investigation and larger population and longer control periods might be necessary. P42 Apparent diffusion coefficient values in the evaluation of renal function Veysel Akgun, Murat Kocaoglu, Hatice Tuba Sanal, Cem Tayfun, Faysal Gok Gulhane Military Medical Faculty, Ankara, Turkey

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Objective The aim of this study was to estimate the correlation between mean normalized apparent diffusion coefficient (ADC) values and split renal functions determined by renal scintigraphy. Materials and methods This retrospective study included 20 children (12 male, 8 female, age range 10 months–13 years) with suspected obstructive uropathy. All patients underwent an MR examination on one of two different 1.5-T systems. We measured the renal parenchymal and paraspinal muscle ADC values and correlate mean normalized ADC values with split renal functions. We used MannWhitney U Test for statistical analysis. Results We found that the mean normalized ADC values of normal functioning kidneys in the same individual were similar. On the other hand, the differences between mean normalized ADC values of each kidney, in the same individual with functionally differing kidneys, were statistically significant (p<0.001). Conclusion These results indicated that measurement of mean normalized ADC has a potential value in the evaluation of the functional status of renal parenchyma. P43 Vertical inversion of the testis: Sonographic recognition of a possible malposition of the gonad Cinzia Orazi, Antonio Spagnoli, Paolo MS Schingo, Fabio Ferro Bambino Gesù Children’s Hospital, Rome, Italy Background Vertical inversion of the testis is a rare malposition of the gonad. It is mostly an occasional finding, which can be recognized for the caudal position of the epididymal head. No changes of the gonadal volume and echotexture are expected. Objective To assess the role of ultrasonography in the identification of this uncommon gonadal malposition. Materials and methods We describe sonographic and color-Doppler findings in 4 patients, ranging from 16 to 18 years of age, complaining about some recurrent scrotal troubles, exacerbating during intense physical activity. On physical examination the testes presented normal volume, consistency and mobility, and the cremasteric reflex was present. Results Sonography confirmed normal-sized, symmetrical testes, with homogeneous parenchymal echotexture. Color-Doppler demonstrated normal intraparenchymal flow. However, the left testis had a peculiar malposition with the epididymal head lying at the bottom of the scrotal sac, and the epididymal tail, with the spermatic vessels, at the top. Because of the vertical inversion of the testis, spermatic vessels were somewhat stretched, but flow was preserved. Low grade varicocele and a small amount of hydrocele were present in 2 out of 4 patients. Conclusion Testicular malposition could be brought on by the absence of the scrotal ligament, due to a developmental anomaly of the gubernaculum testis, which is responsible for gonadal fixation at the bottom of the scrotal sac. Moreover, also a mesorchium relaxation could be responsible for an excessive mobility of the testis in the scrotum, while a greater length of the spermatic cord avoiding a severe kinking of the vessels, could warrant blood supply to the gonad. Two of our patients underwent corrective surgery with normal repositioning of the testis, which was then fixed at the bottom of the scrotum. Sonographic recognition of this anomaly is rather simple and may be an occasional finding, although the abnormal epididymal

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position could be clinically suspected, on the basis of a correct anamnesis. P44 Unilateral urinoma and anterior urethral obstruction from syringocele in a newborn: Role of imaging Cinzia Orazi, Massimiliano Silveri, Fausto M Fassari, Paolo MS Schingo Bambino Gesù Children’ Hospital Rome, Italy Background In fetal and neonatal period urinoma is due to urinary extravasation, through ruptured caliceal fornices. Both urinoma and urinary ascites can be associated with obstructed urinary outflow, such as ureteropelvic junction obstruction and neonatal posterior urethral valves and are related with protected fetal and neonatal renal function, thanks to the so called “pop-off” valve mechanism, that prevents high intravesical pressures with transmittance to the upper urinary tract, which is an hypothesized cause of the development of renal insufficiency. Objective To assess the role of imaging in the recognition of this uncommon urethral obstruction. Materials and methods We report the case of a 2-month-old baby with unremarkable prenatal diagnosis, presenting with sudden onset of febrile urinary tract infection, macroscopic haematuria, and failure to thrive. No reports on micturition characters are given. Results Abdominal sonography revealed a voluminous subcapsular septated collection surrounding the left kidney, which showed a deep scar in the outer surface, widely communicating with the external collection. Bladder wall were slightly thickened. MRI confirmed the extrarenal collection, with fluid presenting intermediate characteristics between urine and blood. Voiding cystourethrography demonstrated the caliceal leak of contrast in the subcapsular and perirenal space. The syringocele appeared as a sort of diverticulum of the bulbar urethra, filling with contrast during the incomplete micturition, bladder only slightly emptying. Conclusion Syringocele represents a congenital or acquired dilatation of Cowper’s ducts. Cowper’s bulbo-urethral glands, homologous to Bartolini’s glands in females, are located between the layers of the urogenital diaphragm and in the spongiosus body, along the bulbar urethra, and their ducts open directly into the urethra. Syringocele may cause hydronephrosis in utero. In the newborn there may be severe obstruction, often followed by renal function deterioration, as in presence of posterior urethral valves. In our case, the “pop-off” mechanism related with the perirenal urinoma guaranteed decompression of the upper urinary tract and preservation of renal function. Endoscopic and/or surgical treatment allows restoration of the normal anatomy. P45 Technique and applications of CT urography in pediatric population Kamil Gurel, Safiye Gurel, Erdal Karavas Abant Izzet Baysal University, Bolu, Turkey Background CT urography has become the most popular method in the evaluation of urinary system pathologies in adult population in the

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last decade. The use of CT urography in pediatric population still has not been that much familiar to most radiologists and clinicans. Objective Our aim is to describe CT urography (CTU) technique with its basic principles and modifications for pediatric age group, discuss advantages and disadvantages of the technique and to demonstrate various examples from different age groups of pediatric population. Materials and methods Between May 2003 and December 2008, 25 patients referred for CT urography to radiology department were included. CTU protocole consists of non-contrast (precontrast (3 mm slice thickness); nephrographic (scanned at 80 s with 10 mm slice thickness) and excretion phases (scanned at 15 min. with 3 mm slice thickness) which were modified depending on the clinical information to avoid excessive radiation risk. Whole urinary system (kidneyureter-bladder) were included in non-contrast and excretion phases while only kidneys are included for the nephrographic phase. Results Uni-/bilateral ureteropelvic junction stenosis (n=5), nonfunctioning kidney (n=1), nephrolithiasis (n=6), ureterolithiasis (n=3), ectopic kidney (n=1), double collecting system (n=2), hypoplastic kidney with extrarenal pelvis (n=1), pelvicalyceal dilatation (n=4), renal agenesis (n=1), sacral agenesis (n=1) were detected. Conclusion The main principle for pediatric CTU should be ‘every case needs individual care and modification of the protocole’. In diagnosis of some complex urologic problems CTU may be necessary in pediatric patients. Selection of patients with appropriate indications, cautious determination of CT parameters considering benefit/ cost in terms of radiation, make it a practical diagnostic tool with all facilites of cross-sectional imaging in pediatric population. P46 Ultrasonografic evaluation of ureteral stones in pediatric patients Umit Yasar Ayaz Ministry of Health Mersin Pediatrics Hospital, Mersin, Turkey Background Ureteral stone disease in pediatric patients require prompt diagnosis to exclude other surgical emergencies and to start efficient treatment. Objective The objective of the study is to report the locations and diameter range of ultrasonographically detectable ureteral stones in our pediatric patients whereas to report some practical points to ease the detection of ureteral stones with ultrasonography. Materials and methods Eighteen patients aged between 8 months and 15 years with sonograhically detectable ureteral stones were included. Abdominal ultrasonography was performed initially. The diagnosis of urolithiasis was confirmed by spontaneous discharge of stones, IVP, surgical procedures or clinical follow-up. A total of 12 males and 6 females with a mean age of 8.7 years underwent abdominal sonography examination with 3–3.5 MHz convex and 7.5–8 MHz lineer probes. Detection of hyperechogenic structure with little or prominent posterior acustic shadowing in a dilated ureter lumen was accepted as diagnostic criteria for ureteral stone. Results In 14 patients (78%), stones were located in distal ureter lumen, whereas in 4 patients (22%) they were located in proximal ureter lumen. In 9 cases (50%) ureteral stones were on the right side and in 9 cases (50%)were on the left. The diameter of the smallest ureteral stone was measures as 2.4 mm and of the largest one was measured as 8.3 mm (mean diameter of ureteral stones was 5 mm).

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During the ultrasonographic examination, the best results were obtained when the patients were in supine position elevating their examined side from the bed between 30 and 90°. Distal ureteral stones were best examined with mild to moderate bladder filling. Overfilling of urinary bladder was a limitating factor for probe maneuvers to detect stones. Conclusion Ultrasonography is a rapid, efficient and safe method to diagnose proximal and distal ureteral stones. P47 Central venous access in children: A comprehensive review J Tisnado, J Tisando, MK Sydnor, DA Leung, DJ Komorowski MCV Hospitals/VCU Medical Center, Richmond, Virgina, USA Background Traditionally the central venous catheter (CVC) placement in children has been performed by pediatric surgeons or operators with little or no experience in catheterization techniques. During the last few years, transition from surgical placement in the OR, to IR placement in the IR suite, is occurring in children as has occurred in the past in adults. Objective We have considerable experience in children. We review methods, techniques; catheter types, selection; patient preparation, sedation; techniques for insertion of tunneled & non-tunneled catheters; hemodialysis catheters; ports;power; ports; and peripherally inserted central catheters (PICCs). Materials and methods We present examples of poorly inserted, nonfunctioning, complicated CVC & ports, and ways to correct, fix or remove nonfunctioning devices. We illustrate examples of complications and ways to solve or avoid these situations. Results CVC placement in children is much easier than in adults. However, IRs are hesitant to insert CVC in children and allow other operators (pediatric surgeons, nephrologists, or personnel with little or no experience in catheterization), to insert these CVCs with significant problems, complications, and a high rate of failure. Conclusion We emphasize a positive approach to CVC placement in children. Sometimes children are small adults and sometimes they are not. P48 CT image guided percutaneous core needle biopsy of bone lessions in children Evanthia Botsa1, Ioannis Koutsogiannis2, Evaggelia Sotiropoulou3, Paraskevi Tsagouli3, Odysseas Konstantinopoulos3, Loukas Thanos3 1. Agıa Sofia Children’s Hospital Athens 2. Bioiatriki Medical Center, Athens 3. Sotiria General Hospital, Athens 4. Tzaneio General Hospital, Athens Objective Accurate diagnosis of bone lesions is important for its successful management. Ct image guided CNB is an acute and safe diagnostic procedure in evaluating bone lesions in children, especially those in areas of diagnostic difficulty. Materials and methods The total number of patients included in this retrospective study was 42. The mean age was 8 years, with a range

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of 2–14 years. For the whole series there were patients with lesions of the shoulder, pelvis, iliac, cervical spine, lumbar spine, thoracic spine and femoral bone. All biopsies were performed under sedation. The bone tissue was obtained using cutting trocar system 14G with a needle of 18G. Results Adequate diagnostic histological material was obtained in 38 out of 42 patients of our cases (90.4%). Four of our patients underwent the procedure for a second time in order to get adequate material for the diagnosis. The histological findings were in 6 patients osteosarcoma, 4 chondrosarcoma, 4 chondroblastoma, 5 lymphoma, 6 istiocytossis, 5 tuberculosis spondilitis, 8 staphylococcal spondilitis. One patient had a small osteoid osteoma of the cotyle, in this case we managed not only to take a tissue sample but to remove the whole nidus. None of our patients had any major complications. Conclusion CT image guided percutaneous CNB of bone lesions is a diagnostically helpful, effective, secure, minimally invasive procedure that can be performed in children. The benefit is more obvious when the lesion is deep seated in the pelvis or spine or very closely related to the neurovascular structure. P49 Primary fluoroscopic gastrojejunostomy placement in infants with mutliple comorbidities Meguru Watanabe, Horacio Padua, Ahmad Alomari, Gulraiz Chaudry Children’s Hospital Boston, USA Background Primary fluoroscopic gastrojejunostomy (GJ) tube placement offers a minimally invasive method of jejunal feeding in children of all ages. Objective We present a review of GJ placement in children less than 12 months old, in whom severe comorbidities precluded a surgical or endoscopic procedure. We review the technique and evaluate the efficacy of the procedure and associated complications. Materials and methods The medical records and imaging were reviewed in all infants who had a primary radiologic GJ tube placement in a 2 year period. The underlying condition and indication for placement was noted. The technique and the catheter used was also documented. Finally, immediate and long-term outcomes were assessed, including major and minor complications. Results There were 14 infants (6 m, 8 f). The mean age was 4.1 m and the mean weight was 4.2 kg. The primary diagnosis was prematurity with feeding difficulties in 4, complex cardiac disease in 4, neurodevelopmental disorder in 2, respiratory compromise in 2 and GI disorder in 2. The indication was reflux/aspiration in all and poor feeding in 6. A 8.5 F Cook or 10 F Carey-Alzate catheter was used. Mean follow-up period was 16.8 months. One patient died from the underlying cause unrelated to the procedure. The other 13 patients (93%) had a functioning GJ tube at the end of the follow up periods. These 13 patients gained weight along the normal growth curve. There were no major or intra-procedural complications. Minor complications included a leak around the tube in 3 patients (21%), skin erythema in 3 (21%), displacement of the catheter (43%) in 6 and granulation at the skin insertion site in 2 (14%). Conclusion Primary fluoroscopic gastrojejunostomy tube insertion in infants is effective and safe, even in the presence of significant comorbidities.

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P50 Symptomatic hepatic cyst in a child: treatment with single-shot injection of tetracycline hydrochloride G Fabrizzi, C Lanza, G Pieroni, V Bolli, V Galeazzi, B Fabrizzi, A Martino Azienda Ospedaliero-Universitaria Ospedali Riuniti, Italy Background Treatment of symptomatic hepatic cysts is problematic and controversial. Surgery has been the traditional therapy, but it carries a high morbidity rate. Percutaneous aspiration alone is only transiently effective. The combination of aspiration and sclerotherapy has provided good results. Objective We review the treatment of symptomatic solitary hepatic cysts in childhood and described a pediatric case of benign hepatic cyst successfully treated by the instillation of tetracycline hydrochloride (HCL). Materials and methods A 11 years old boy was admitted to our pediatric hospital for abdominal pain. Ultrasound and MRI scans showed a large solitary hepatic cyst of 5.2×6.2×9.4 cm (volume 160 cc) in the posterior liver segment. The cyst was punctured with a 21-gauge Chiba needle under at real-time US imaging. After aspiration of 10 cc of the cyst content, the cyst was opacified by injecting the same volume of iomeprol, a non ionic contrast agent, under fluoroscopic guide to check for the absence of communication between the cyst and the biliary tree and to test for the absence of leak into the peritoneal cavity. After that 200 mg of tetracycline HCL solution (5%) was injected into the cystic cavity and wasn’t aspirated before needle removal. This injection was performed only once. Results Complete regression was found at 3 months US and MR examination with total collapse of the cyst. No immediate or late complications occurred and the patient have remained symptom free. Conclusion To our knowledge, this is the first pediatric case reported in literature where a solitary liver cyst was treated with sclerotherapy using tetracycline HCL. We propose that injection of tetracycline HCL is in pediatric patients an efficient and safe treatment with short hospitalization. P51 Complications of image-guided gastrostomies and gastrojejunostomies in children and their management Francoise Rypens, Josée Dubois, Laurent Garel, Valérie Marchand, Dickens Saint-Vil, Louise Lalande Department of Imaging, Hospital Ste-Justine, Canada Background Gatrostomies and gastrojejunostomies are two well established methods of providing long-term enteral nutrition in children where oral intake is not sufficient to maintain adequate caloric and nutritional support. Surgery, endoscopy, and interventional radiology can all provide the percutaneous access. Eventhough the radiologic guided procedure is the least invasive of the three methods, complications related to the procedure do occur, some of them potentially lethal, and tube maintenance issues (TMIs) are frequent. Objective – To present and demonstrate major and minor complications, and TMIs observed after image-guided procedures, and to discuss circumstances of occurrence, and management procedures.

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To illustrate the complementary role of interventional radiology after endoscopic or surgical procedures. Materials and methods Retrospective analysis of the radiological and clinical data of all children who underwent image-guided gastrostomies and gastrojejunostomies in the department of medical imaging of our institution. Review of the literature. Results Events occurring during the procedure include: access failure, access loss, difficulty in obtaining access, retention suture loss, pneumoperitoneum, hemorrhage, misplacement, bowel transfixion, and hepatic or splenic injuries.Postprocedural complications include: peritonitis, sepsis, ileus, accidental dislodgment, bowel obstruction due to intussusception or retained fragment, tube migration, site infections, site discomfort), and TMIs (granulomas, tube breaks, obstructions, leakage, migration, dislodgment and displacements) are described and discussed. TMIs include granulomas, and tube breaks, obstructions, leakages, migrations, dislodgments and displacements. Conclusion Percutaneous placement of gastrostomies and gastrojejunostomies is a team work. In our experience, the most serious complications occured in immunocompromised patients. Small babies were more prone to tube displacement and bowel obstruction than older patients. Specifically designed material is still lacking for small children. TMIs usually require to change the tube. P52 Symptomatic parapelvic renal cyst: Treatment of single-session percutaneous drainage and ethanol sclerotherapy Medine Boge, Turkmen Ciftci, Devrim Akinci, Okan Akhan Faculty of Medicine, Hacettepe University, Ankara, Turkey Background A 12 year-old girl with symptomatic parapelvic renal cyst was treated by percutaneous drainage and ethanol sclerotherapy which is widely used as an effective and non-invasive treatment method in symptomatic simple renal cysts. Material and methods Procedure was performed under local anesthesia and intravenous sedation in prone position . After the puncture of the 3 cm parapelvic cyst with 20 G Chiba needle under ultrasonographic guidance; cystogram was obtained to evaluate the communication with the pelvicalyceal system and retroperitoneal extravasation. Then 95% ethanol of 30–40% of the initial cyst volume, as the sclerosing agent, was injected into the cystic cavity. The ethanol was left into the cavity for 10 min to destroy cyst epithelium. At the end of the procedure ethanol was reaspirated and the needle was withdrawn. Results After the sclerotheraphy the cyst was followed by sonography 1, 3, 6 and 12 months after the procedure and yearly afterwards. For a period of 3 years and six months follow-up, the patient was completely symptom-free (pain and upper pole hydonephrosis) and the cyst showed complete resolution. Discussion The parapelvic renal cysts are originated from renal parenchyma and lying down to the renal hilus. Most are asymptomatic but if a parapelvic cyst becomes symptomatic, the treatment is necessary. Percutaneous drainage and ethanol sclerotherahy is performed mainly in cortical cysts. However, it is less commonly experienced in parapelvic cysts due to needle course through the renal parenchyma and proximity of the cyst to the renal hilus. In our case total resolution of the cyst and symptoms could be achieved with single session sclerotherapy.

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P53 Odontogenic cysts, tumors and fibro-osseous lesions in children: A radiological pictorial case report Azian Abd Aziz1, Vincent C Jesu2, S Yogeswari2 1. International Islamic University Malaysia 2. Hospital Tengku Ampuan Afzan, Kuantan, Pahang, Malaysia We present pictorial illustrations of pediatric patients with odontogenic cysts, tumors and fibroosseous lesions presented in our institution. These include dentigerous cyst, odontogenic keratocysts, calcifying odontogenic cyst, ameloblastoma, adenomatoid odontogenenic tumor and ossifying fibroma. All the cases were confirmed on histology. Modalities for diagnosing these lesions include dental intraoral x-rays, orthopantomography (OPG) and computed tomography (CT) scans. CT scanning is helpful for very large lesions and to determine if bone is eroded by lesion. In our cases, some of these lesions were depicted on dental intraoral radiographs and orthopanthomography while CT was performed on some cases. Several studies were done previously to characterize and differentiate various cystic lesions and tumors in dental and maxillomandibular region based on the radiological features. However no conclusive information has been made to allow accurate diagnosis based only on radiological features. The aim of these pictorial illustrations is to highlight various radiological appearances of such lesions as in some centers the radiographs are usually seen only by the oral surgeons. P54 Normal sizes of the neck lymph nodes in Turkish pediatric population Duzgun Yildirim, Murat Kocaoglu, Mutlu Saglam, B Haci Hamdioglu, Vedat Okutan, Taner Ucoz Kasimpasa Navy Hospital, Turkey Background There are about 300 lymph nodes in the neck. All of them can be easily examined with ultrasonography (US). Similar to the other ones, neck lymph nodes also can enlarge abnormally due to different causes (enfectious, inflamatory or neoplastic). Sometimes reactivated neck lymph nodes in the pediatric population may loose their normal central fatty echogenity. In this instance, size can be the most important parameter to establish the abnormal node(s). Regretfully saying, we couldn’t found any other study in the literature that has mentioned the normal sizes of the neck lymph nodes in normal pediatric population. Objective The purpose of this prospective study was to measure the cervical lymph node sizes in normal pediatric cases and to present a scale for guiding sonographist. Materials and methods A total 104 patients were included (mean age 9.4 years, m:63, F:41) in study. Complete blood count and routine biochemistry of the patients were also done. At the ultrasound examinations, using the high resolution lineary transducer, the shortest and then the longest axis diameters of the lymph nodes of the neck are measured electronically. Results All patients were normal to the physical examination. Routine labratory studies were all changing in normal ranges. The mean diameters of the neck lymph nodes according to the nodal

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classification schema (levels, respectively) were in the following way: I:6.8–3.6, II:18.7–8.2, III:2.7–1.5, IV–V:8.1–4.2, VI–VII:4.9–2.4, VIII:6.5–3.4 (values measured in millimeters). Conclusion It is essential to be conscious of the normal values of the neck lymph nodes in the normal pediatric population when dealing with. We believe this study will be a reference guide for radiologists who have to determine the abnormally enlarged neck lymph nodes. P55 The imaging characteristics of lymphangiomas: Pictorial essay Harvey EL Teo KK Women’s and Children’s Hospital Background Lymphangiomas or cystic hygromas are congenital malformations of the lymphatic system. It is important to accurately diagnose these lesions to ensure appropriate management and therapy. Whilst these lesions are benign, they can be extensively infiltrative causing local symptoms requiring therapy. Occasionally, aggressive mixed lyphangiomatous and vascular tumours of the soft tissues may occur. Objective This pictorial essay will demonstrate the imaging characteristics of lymphangiomas in paediatric patients on ultrasound, CT and MRI. Familiarity with the imaging features will enable the radiologist to accurately assess, diagnose and stage these lesions. Results Lymphangiomas appear as transcompartmental multiloculated cystic lesions. The cystic areas are circumscribed and discrete. Marginal enhancement on cross-sectional imaging is usually present. Ultrasound is useful in the evaluation of small superficial lesions but is limited in determining the extent of spread in larger and deeper lesions. CT is useful in diagnosing and staging these lesions but results in exposure to ionizing radiation. The contrast resolution of CT is also inferior to MRI which is the modality of choice. The superior contrast resolution on MRI makes it the most sensitive modality for diagnosing and determining the extent of spread of these lesions. MRI can also diagnose mixed lesions by demonstrating flow signal changes and tubular, enhancing vascular channels within these lesions. Conclusion The ability of the different imaging modalities to appropriately diagnose and stage lymphangiomas in children is important and will be demonstrated in this pictorial essay. P56 MDCT angiography of right-sided aortic arch with aberrant left subclavian artery and duplicated left vertebral artery Berna Oguz, Adalet Elcin Yigit, Kader Karlı Oguz, Mithat Haliloglu Department of Radiology, Hacettepe University, Ankara, Turkey Background Congenital anomalies of the aortic arch and its branches are commonly encountered in radiological practice. A right-sided aortic arch (RAA) with an aberrant left subclavian artery (ALSA) is a rare anomaly that occurs in 0.05% of the population. Duplicated vertebral artery anomaly is very rare either depicted incidentally in autopsy series, or angiographic studies including noninvazive MR and CT angiographic studies which have been increasingly utilized in daily practice.

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Objective To present MDCT angiographic findings of an unusual case of duplicated left vertebral artery associated with right-sided aortic arch and aberrant left subclavian artery. Materials and methods The barium swallow of a 7-year-old boy revealed a posterior impression to esophagus on the lateral view suggesting vascular ring. MDCT angiography was performed subsequently to provide the definitive diagnosis by using a 16-slice MDCT scanner. 3D volume-rendered and maximum-intensity-projection images were obtained from the axial images. Results MDCT angiography identified RAA with ALSA arise from a diverticulum of Kommerell located posterior to the esophagus. No airway compression was identified. MDCT angiography also demonstrated that left vertebral artery (LVA) had 2 seperate origins, from left common carotid artery and ALSA respectively, called as “duplicated vertabral artery”. Both vessels coursed straight up and united at C6 vertebral level to continue as the LVA and entered the foramen transversarium at the same level. The right vertebral artey was normal originating from the right subclavian artery. Conclusion During the long life span of the children, vascular anomalies may become important in the planning of interventional and surgical procedures. Knowing of the aortic arch and vertebral artery anomalies before the neurointerventional and neurosurgical procedures prevents complications. Radiologists should be familiar with various types of vascular anomalies since wider application of MDCT angiography, with excellent 3D images, increased the incidence of these anomalies in daily practice. P57 Ultrasound studies of newborn of diabetic mothers Anna Szymaska-Dubowik, Iwona Janczewska, Iwona DomalskaPopadiuk, Agnieszka Bianek-Bodzak Medical University of Gdask, Poland Background Diabetes mellitus of the mother can cause fetal and newborn abnormalities and is estimated to be indication for ultrasound head and abdomen examination of the newborn. The most common abnormalities are macrosomia and enlargement of internal organs. Objective Retrospectively evaluated results of ultrasound studies of newborn of diabetic mothers. Materials and methods The ultrasound study of 148 newborn of diabetic mothers was performed in second day of life. The children underwent both head and abdomen examinations. There were 59 newborn of mothers with diabetes mellitus (DM) and 89 of mothers with gestational diabetes mellitus (GDM). Eighteen newborns have features of diabetic fetopathy but only 4 of them were children of mothers with GDM. Results Abnormal results of head ultrasound examination were found in 10,8% of newborn. The abnormalities were: asymetric lateral ventricle, asymptomatic cysts of the choroid plexus, increased CSF in the extraaxial spaces and intracranial haemorrhage grade I .Abnormal results of abdomen ultrasound examination were found in 20,2% of newborn. They were: hepatomegaly, hyperechoic renal papillae, renal abnormalities, situs inversus, dilatation of the renal pelvis and calyces, hiperechogenic echoes in bladder. Four percent of newborn showed changes in both examinations.There were no characteristic abnormal-

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ities in the group with DM or in the group with GDM or in newborns with fetopathy. Conclusion Abnormalities were found in 35,1% of examined newborn.The most common changes in abdomen ultrasound examination were: hepatomegaly and hyperechoic renal papillae and in head examination: asymetric lateral ventricle. P58 Neoplasms in HIV infected kids: A pictorial essay Aadil Ahmed1, Aasif K Rooknoodeen2 1. Children’s Hospital, Westmead, Sydney 2. Chris Hani Baragwanath Hospital, Johannesburg Background Neoplastic disease is an increasing problem in adults and children with acquired immunodeficiency syndrome (AIDS).As the immune suppressed population increases and kids with human immunodeficiency virus (HIV) survive longer and longer, due to more widespread antiretroviral chemotherapy usage, we are encountering common and rare malignancies more often than previously described.There is an increased incidence of lymphoproliferative disorders and soft tissue tumors, as well as a multitude of other rarer childhood tumors. Objective To describe some of the imaging features and range of neoplasms in HIV-infected children. P59 A pictorial ultrasonographic review of paediatric neck masses Caroline Corry, Kaseem Ajılogba Royal Hospital for Sick Children, Edinburgh, UK Background Neck masses are common findings in children. The knowledge of the neck spaces/compartments, defined by fascial planes, and their contents provides an approach to differential diagnosis. Ultrasonography, a “child friendly” tool, should be the first modality for assessment. Objective To illustrate the ultrasonographic spectrum of paediatric neck masses based on the knowledge of compartmental anatomy and demonstrate significant pathology with multimodality correlation. Teaching points Identify the fascial compartments and constituent structures of the paediatric neck; identify the locations and typical ultrasonographic appearances of common paediatric neck masses with multimodality correlation and discuss the significant diagnostic role of ultrasonography in the assessment of the paediatric neck. Conclusion Paediatric neck masses are a common finding. The knowledge of the neck spaces and their constituent structures combined with ultrasonography, as the initial imaging modality, is very helpful in making a correct diagnosis that allows appropriate management. P60 Intracranial haemorrhage in childhood haemophilia Kaseem Ajilogba1, Chris Barnes2, Michael Dithfield2 1. Royal Hospital for Sick Children, Edinburgh 2. Royal Childrens’ Hospital, Melbourne, Australia

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Background Haemophilia is an X-linked disorder due to a deficiency of factor VIII or IX characterised by joint and muscle haemorrhages and prolonged, potentially fatal haemorrhage after trauma or surgery. However, bleeding does occur at other sites such as intramuscular haematomas and the “closed-space” bleeding phenomenon. Intracranial haemorrhage, a “closed space” event, is a severe but uncommon complication of haemophilia. Objective The aim is to review the incidence of intracranial haemorrhage in children with haemophilia attending a tertiary paediatric centre. Materials and methods A retrospective review of patients identified by records maintained by the Henry Ekert Haemophilia Treatment Centre between January 1991 and December 2005 was done. The disease severity, general radiological investigations and specifically initial neuro-imaging were analysed and the incidence of intracranial haemorrhage matched with disease severity. Results 102 patients were identified (82 haemophilia A; 20 haemophilia B). Of these, 18 (18%), 19 (19%) and 65 (63%) had mild, moderate and severe disease respectively. Sixty-three (61.8%) patients (aged 3 months to 18.5 years, mean 8.4 years) required imaging, of which 7 (11.1%) had CT; 7 (11.1%) had ultrasonography and 49 (77.8%) had plain radiography. All in the CT group had examination of the head—5 (71%) were under 5 years of age and 2 (29%) under 7 years of age. Four (57%) had normal scans and 3 (43%) had nontraumatic intracranial haemorrhage; two of whom were under one year and the other, aged six. Two of those who had intracranial haemorrhage had moderate disease and the other, severe. Conclusion Intracranial haemorrhage is an uncommon but significant complication of childhood haemophilia that can be associated with significant morbidity and mortality. Education of patients, carers and medical professionals should also include advice on symptoms that must alert to possible intracranial haemorrhage. P61 Vascular anomalies made easy Philip John, Oscar Navarro, Joao Amaral and Dimitri Parra The Hospital for Sick Children, Toronto, Canada Background Vascular anomalies in infants and children are clinically diverse and continue to pose clinical and radiological dilemmas. Establishing the correct diagnosis is important for prognosis and ensures that appropriate treatment can be undertaken. Objective The purpose of this poster is to describe salient clinical features and important imaging findings of vascular anomalies. Typical and variant radiological appearances will be illustrated. This will provide the general pediatric radiologist with a better understanding of the appearance and a practical approach to vascular anomalies. Materials and methods Selected cases with a known diagnosis from the Vascular Anomalies and Dermatology clinics databases at the Hospital for Sick Children, Toronto, were retrospectively reviewed. Results The cases selected reflect the common clinical and radiological findings of vascular anomalies and also the imaging variants, illustrating the diversity of these conditions. Conclusion Increasing the awareness of the imaging findings of vascular anomalies can provide the general paediatric radiologist with a practical approach to vascular anomalies.

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P62 MR findings of Rosai Dorfman disease in two siblings with cervical masses that mimics lymphoma Sinan Akay, Veysel Akgun, Murat Kocaoglu, Cem Tayfun Gulhane Military Medical Faculty, Ankara, Turkey Background Rosai-Dorfman disease (RDD), also known as sinus histiocytosis with massive lymphadenopathy, is a rare histiocytic proliferative disorder. Patients usually present with massive cervical lymphadenopathy but other nodal sites such as mediastinal or inguinal are also frequently involved. Objective To underline the importance of RDD in the differential diagnosis of the cervical lymphadenopathy in pediatric age group. Materials and methods 11 and 12 year-old two siblings with bilateral cervical lymphadenopathies admitted to our radiology department for Magnetic Resonance (MR) imaging for suspected lymphoma. Results In both patients, MR images demonstrated multiple massive lymphadenopathies in cervical regions mimicking lymphoma, one of the most common causes of malign lymphadenopathy in pediatric age group. No extranodal involvement was determined. In both cases, biopsies taken from cervical lymph nodes confirmed the diagnosis of RDD histopathologically. Conclusion Both of the cases showed that RDD must also be included in the list of differential diagnoses of diffuse and massive lymphadenopathy beside infectious/granulomatous conditions, lymphomatous and metastatic diseases.

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2. Department of Ophthalmology, Faculty of Medicine, Uludag University, Bursa, Turkey 3. Department of Pathology, Faculty of Medicine, Uludag University, Bursa, Turkey Background Several tumors or tumorlike lesions involve the orbital wall in children. They may arise directly from the orbital bones or secondarily involve the orbital wall via metastasis or via direct extension from other sites. They show a wide histological spectrum, from developmental anomalies to neoplastic and proliferative disorders, and cannot be differentiated through clinical findings. Imaging studies can play an important role in diagnosis and management of these lesions. Objective To present a pictorial review of clinical, imaging and pathologic features of orbital wall lesions in children. Materials and methods The lesions that will be discussed include dermoid inclusion cyst, fibrous dysplasia, juvenile ossifying fibroma, Langerhans cell histiocytosis, granulocytic sarcoma, sinonasal mucocele, Ewing sarcoma/PNET, sinonasal lymphoma, sinonasal chondroma, plexiform neurofibroma, orbital bone metastases from neuroblastoma, and subperiosteal abscess. Results and conclusion Many lesions of the orbital wall in children such as dermoid inclusion cyst, fibrous dysplasia, sinonasal mucocele, plexiform neurofibroma, or subperiosteal abscess can be identified at imaging with their characteristic features. The others may show overlapping imaging findings. Nevertheless, a presumptive diagnosis may be suggested from imaging studies by understanding their clinical-radiologic-pathologic correlation.

P63 P65 A wolf in sheep’s clothing—Serious pathology presenting as seemingly trivial lesions K Taylor-Robinson, C Farrell, S Harave, C Landes Alder Hey Children’s NHS Foundation Trust, UK Background Urging readers to think outside the box we present a series of cases from a large children’s hospital where the patient’s first presentation was a seemingly classic example of fairly trivial pathology. On further investigation all of these patients were revealed to have serious, aggressive pathology including malignancy. Materials and methods Cases include an arm lesion which had the appearances of a simple haematoma which was later revealed to be a PNET metastasis and an inguinal hernia which was later shown to be a large intra-abdominal kaposiform haemangionendothelioma with life threatening consumptive coagulopathy. Conclusion In radiology as in all specialties doctors experience fatigue in frequently reporting trivial cases. We reflect upon the aspects of these cases that prompted further investigation. These cases highlight the need for vigilance in the assessment of common findings. P64 Tumors and tumorlike lesions of orbital wall in pediatric patients Zeynep Yazici1, Bulent Yazici2, Ulviye Yalcınkaya3, Ercan Tuncel1 1. Department of Radiology, Faculty of Medicine, Uludag University, Bursa, Turkey

Fluid levels in pediatric imaging: A compendium Kamaldine Oudjhane, Mohammed Al Otaibi Hospital for Sick Children , University of Toronto, Canada Background The observation of fluid levels in imaging requires the presence of a cavity and of immiscible fluids identified on an image which is vertically oriented. The significance of such signs varies according to the involved sites and the clinical settings. Objective To illustrate a spectrum of examples of fluid levels encountered with different modalities in pediatric imaging and to discuss their appearances and their clinical significance. Materials and methods This is an iconographic selection from a retrospective review of radiology database from our institution for the last 8 years regarding Fluid Levels identified in various imaging studies including radiographs, US, CT as well as MRI. Results Fluid levels are variable in nature: air/fluid versus fluid/fluid versus fluid/layering material levels. Multiple entities at different sites carry these signs such as cavities or infectious lesions or structures communicating with the airways seen of chest radiographs or CT. Air/ fluid levels are common in normal bowel but major ones represent intestinal obstruction. On CT of the peritoneal cavity they mean G I tract perforation or abscess collections. In the pelvic or cervical masses, fluid/fluid level heralds likely a hemorrhagic complication. Different ages of hemorrhage may be delineated with fluid levels on CT of a subdural hematoma. MRI brings more sensitivity to tissue contrast (different signal intensities of acute/chronic hemorrhage,

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slow flowing blood). Lipohemarthrosis level means communication between marrow space and joint space in skeletal trauma. Fluid/fluid levels, a non specific sign in musculoskeletal neoplasms, are encountered in aneurysmal bone cyst, synovial sarcoma, or bone cyst among others. Conclusion Fluid levels may be observed with all imaging modalities. Their clinical significance varies with the involved organ and the clinical settings.

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Objective We present a pictorial review of some of the common and more unusual MRI findings in SNHL as seen in a tertiary referral paediatric hospital. These include examples of cochlear nerve absence and hypolasia, vestibular aqueduct dilatation and semicircular canal abnormalities. Less frequently seen intracranial causes are also discussed. Conclusion Interpretation of MRI of the inner ear is an important skill for any paediatric radiologist. We aim to provide an accessible pictorial review of MRI inner ear findings.

P66 P68 Multi-slice computed tomography and the detection of asymptomatic vascular anomalies in children G Pieroni, C Lanza, V Bolli, L Amici, V Galeazzi, G Fabrizzi Azienda Ospedaliero-Universitaria Ospedali Riuniti, Italy Background Abnormalities of the vena cava system are usually asymptomatic, hemodynamically insignificant and discovered incidentally during CT scan. Recently-devised 3-dimensional (3D) diagnostic modalities such as magnetic resonance imaging and multi-slice computed tomography (MSCT) allow visualization of the great vessels from any angle of view and perspective. Among them, the MSCT examination provides highly contrasted 3D images of complicated congenital vascular anomalies. Objective The CT imaging appearances of the vena cava system anomalies are presented. In addition, the clinical relevance of the variations is discussed. Materials and methods We reviewed records of 4 children hemodynamically asymptomatic (mean age 4 years) that underwent MSCT for surgical abdominal planning. Results CT scans showed 2 duplications of the IVC and 2 persistent left superior vena cava (PLSVC) In double IVC the left IVC end at the confluence with the left renal vein which crosses anterior to the aorta in the normal fashion to join a normal prerenal IVC. Patients with bilateral superior vena cava (SVC) had a normal rightSVC and a PLSVC. Conclusion Vascular structures are usually readily identified on MSCT scans of the abdomen and pelvis obtained with intravenously administered contrast material. The MSCT is a promising tool for the precise diagnosis and planning of surgical operation. Awareness of these anomalies is necessary to avoid diagnostic pitfalls. P67 MRI appearances of sensorineural hearing loss in paediatric patients C Farrell, K Taylor-Robinson, S Harave, M Tawil Alder Hey Hospital, UK

Traumatic abdominal wall herniation Ferda Bacaksizlar Sari, F Demir Apaydin, Meltem Nass Duce, Engin Kara Department of Radiology, Faculty of Medicine, Mersin University, Mersin, Turkey Background Traumatic abdominal wall herniation is a rare condition, which occurs secondary to blunt abdominal trauma. When intraabdominal pressure increases suddenly or splitting forces are applied to the abdominal wall, traumatic abdominal wall herniation takes place from anatomic weak areas. The diagnosis is often done by means of physical examination, which however can be difficult because of the abdominal wall tenderness, or by abdominal computed tomography (CT). Objective Our aim is to present a case of traumatic abdominal wall herniation and to discuss the relevant literature. Materials and methods A 21-months-old boy, who was overrun by a tractor, was admitted to our hospital. On admission, he had diffuse abdominal tenderness. He was conscious. Physical examination revealed a tender bulging mass and ecchymosis on the left upper quadrant of the abdomen. We examined the patient by chest x-ray, plain abdominal film and abdominopelvic CT exam which was performed by a 64-slice multidetector CT. Results His chest X-ray and abdominal plain film were normal. On the CT of the abdomen and pelvis, an abdominal wall herniation on the left upper quadrant was demonstrated and the small bowel loops were shown to be located subcutaneously in the anterior thoracic wall. The patient was operated and the defect was repaired. Conclusion Traumatic abdominal wall herniations are rare in pediatric population. In children with diffuse abdominal tenderness following a blunt abdominal trauma, the possibility of such a diagnosis should be remembered even if the chest x-rays or the abdominal plain films are normal. In such cases, CT can be considered as a useful diagnostic tool. P69

Abstract MRI Appearances of Sensorineural Hearing Loss (SNHL) in paediatric patients Background Sensorineural deafness is the paediatric population can be either congenital or acquired. Traditionally plain film and CT have been used to image patients with SNHL but the superior soft tissue detail provided by MRI has resulted in its becoming the investigation of choice. MRI allows visualisation of the cochlear nerve which is crucial to the planning of cochlear nerve implants, detail which is not seen on CT. This technique also avoids the use of ionising radiation.

Importance of free intra-peritoneal fluid at ultrasound in children with blunt abdominal trauma Mehmet Selim Nural, Cinar Balcik, Muzaffer Elmali, Meltem Ceyhan Radiology Department, Faculty of Medicine, Ondokuz Mayis University, Samsun, Turkey Background Computerized tomography (CT) is used widely as first screening method for blunt abdominal trauma (BAT). The risk related

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to radiation is increased especially in children under that issue. The knowledge of usefulness of ultrasound (US) in management of patients with BAT will decrease unnecessary CT examination. Objective To assess the importance of the US finding of free intraperitoneal fluid without solid organ injury after BAT in children. Materials and methods The clinical and imaging data of 130 children admitted to emergency department between July 2007 and December 2008 with BAT were reviewed retrospectively. All children had an abdominal US as the primary screening method. Patients without solid-organ injury and with free intraperitoneal fluid at US examination were included. Intraperitoneal fluid was localized. US results were compared with findings of CT, diagnostic peritoneal lavage, laparotomy and clinical course. Results US examination revealed free fluid and/or solid-organ injury in 8 and only free intraperitoneal fluid in 14 patients. Two (14%) out of 14 patients had intrabdominal organ injury (one solid-organ injury, the other one intestinal injury required an operation). Among the 108 patients with negative finding at US, only one had solid-organ injury (false negative). Intraperitoneal fluid was located in pelvis in eight patients with two of them had pelvic wall injury. Fluid was involved the pelvis and abdomen in six patients: two had intrabdominal injury; one was surgical. All but one were followed up at emergency unit or hospitalized without need of any surgery and discharged. Conclusion US is an effective screening method in hemodynamically stable patients with BAT. Because the risk of serious intraabdominal injury is low in patients with only free fluid in pelvis detected by US, it seems sufficient to follow up clinically of these patients. The presence of free fluid beside pelvis in any location needs additional imaging methods. P70 Ultrasonographic imaging of the spleen in patients with sickle- cell disease MG Papadaki2, S Franchi Abella1, S Tammam1, F Sariego1, H Moschouris2, D Pariente1 1. Department of Pediatric Radiology, Le Kremlin Bicetre-FR 2. Department of Pediatric Radiology, Tzanio-GR Background Splenic abnormalities are very common in patients with sickle cell disease. Objective The aim of this study is to investigate the spectrum and prevalence of ultrasonographic findings of the spleen in these patients. Materials and methods The study included 72 patients with sicklecell disease, 15 homozygous for sickle-cell anemia (S/S) and 57 with sickle β thalassemia (Th/S). The patients’ age ranged from 1 to 40 years, with 40 males and 32 females. At the time of ultrasonographic examination 32 patients had already undergone splenectomy (4/15 with S/S and 28/57 with Th/S). Results Splenomegaly was present in 26 patients (24 with Th/S and 2 with S/S) with detectable infarcts in 11/26 patients. Mild, moderate and marked splenomegaly shared equal percentages (33%) among patients with Th/S and splenomegaly. Marked splenomegaly was present in two patients with S/S. A small sized, calcified spleen was visualized in 4 patients with S/S. Splenic nodules were revealed in two patients with S/S. They were homogeneous and isoechoic or slightly hyperechoic to the splenic parenchyma. MR imaging in these

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patients confirmed the presence of these nodules, hyperintense in T1 and T2 weighted images. Conclusion Ultrasound imaging has an undisputable value in detecting complications of sickle-cell syndromes. One should be aware of findings’ variations so as to avoid further unnecessary examinations. In S/S patients, splenic nodules may be revealed, and their benign nature can be confirmed by MR. P71 Evaluation of venous anomalies in klipppel-trenaunay syndrome with direct CT venography evaluation of venous anomalies in Klipppel-Trenaunay syndrome Ertugrul Mavili, Yigit Akcali, Halil Donmez, Ali Yikilmaz, Selim Dogan, Mehmet Ozturk Medical Faculty, Erciyes University, Kayseri, Turkey Background Klippel-Trenaunay syndrome is a rare combination of complex vascular malformations. There are different noninvasive and invasive techniques to assess KTS. CT venography (MDCTV) is a new modality that may be used for complete assessment of vascular abnormalities in KTS. Objective To evaluate the effectiveness of multidetector CT venography for the evaluation of lower extremity anomalies in KlipppelTrenaunay Syndrome (KTS). Materials and methods Eight pediatric patients with KTS were included in the study. The clinical findings were recorded and a CT venogram was obtained by using a 16-slice multidetector CT scanner after administration of contrast material via superficial veins of the dorsal feet. CT images were evaluated for soft tissue thickening, bone hypertrophy, and for the abnormalities of superficial and deep veins by using axial, MPR, MIP and volume-rendered images. Results Six patients were KTS type 1 and 2 patients were KTS type 2. In 6 patients blotchy stains were seen while the other 2 patients did not have stains. All patients had soft tissue thickening and three patients had hypertrophy of the affected limb. Venous abnormalities were present in all the patients. Varicose veins were the most encountered abnormality. Femoral vein and popliteal vein were the most common involved veins in 7 and 6 patients; respectively. Vena cava inferior was affected in 2 patients. Volume rendered and MIP images were effective for demonstrating the whole venous system in its full length; however, in one patients the femoral veins were not seen on MIP and volume-rendered images and sectional images were able to demonstrate these hypoplastic femoral veins. Conclusion Multidetector CT venography provides the opportunity of evaluating the whole venous system together with bone and soft tissue abnormalities in only one examination. The axial, MPR, MIP and volume-rendered images should be evaluated together in order to avoid misinterpretations. P72 Hydatid disease (HD): What about unusual locations in pediatric population? S Deftereos, A Oikonomou, P Mintzopoulou, A Spanoudaki, E Vranou, P Prassopoulos University General Hospital of Alexandroupolis, Greece

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Background HD is a worldwide parasitic disease produced by the larval stage of Echinococcus, endemic in central and northern Europe, the Mediterranean, northern Asia, China, Japan, Turkey and parts of North America. Liver and lungs, in children, are the organs most frequently affected with typical and well known imaging findings. On the other hand, unusual anatomic locations, the related imaging findings and rare manifestations of HD are less frequently described. Objective To discuss the prevalence and imaging findings of unusual anatomic locations of HD in pediatric population. Materials and methods Radiological findings range from purely cystic to completely solid lesions that can be solitary or multiple. They can become quite large, especially the pulmonary lesions and in some atypical cases growth rate may overcome duplication annually. Calcification is rarely seen in pulmonary locations but is often in liver, spleen and kidney. Gallbladder, biliary, adrenal, peritoneal and brain locations are rare and may exhibit findings not similar to liver HD. Exophytic growth and transdiaphragmatic migration of liver HD is a rare manifestation. The diagnostic tool indicated depends on the organ involved and the evolution stage of the disease. US is the method of choice in purely cystic lesions, with floating membranes and daughter cysts. CT is preferred for chest diagnosis and is best for demonstrating calcifications and complications. MR imaging is especially helpful in detecting HCs of the central nervous system. Conclusion Familiarity with unusual locations of HD and atypical radiological manifestations enables usage of best diagnostic tools and accurate diagnosis of the disease.

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tated ECMO-treatment. During the treatment seizures and intermittent hypertension with dilated pupils were noted. Cranial CT showed bilateral hypodense regions in the basal ganglia and thalami but could not differentiate toxic oedema from infarction/necrosis. Therefore the patient was prepared for MRI using non-wired cannulas, 2 m extra tubing and a mobile ECMO-system that we had previously tested for MRI. The brain was examined with conventional imaging including diffusion weighted imaging and proton spectroscopy. Results High quality images of the brain were obtained without disturbing the function of the ECMO system. Spectroscopy was successfully conducted with clear visualization of pathological metabolites. As expected MRI provided critical information for the lesions characterization and extension. Widespread infarction/necrosis with hemorrhagic components were diagnosed in the basal ganglia, thalami, brainstem and corticospinal tracts. Conclusion MRI can safely be performed and provide important information in patients with neurological complications during ECMO treatment. P74 Congenital infiltrating lipoma of foot, trunk and face: Report of three cases Sureyya B Gorkem1, Mustafa Ozturk1, Ali Yikilmaz1, Atilla Coruh2 1. Department of Radiology, Medical School, Erciyes University 2. Department of Plastic Surgery, Medical School, Erciyes University

P73 MRI in a patient during ECMO treatment M Lidegran1, C Wang2, U Hildingsson3, K Palmér4, B Nordell5, B Frenckner6 1. Departments of Paediatric Radiology, Karolinska University Hospital, Stockholm, Sweden 2. Neuroradiology, Karolinska University Hospital, Stockholm, Sweden 3. ECMO, Karolinska University Hospital, Stockholm, Sweden 4. ECMO, Karolinska University Hospital, Stockholm, Sweden 5. Medical Physics, Karolinska University Hospital, Stockholm, Sweden 6. Paediatric Surgery, Karolinska University Hospital, Stockholm, Sweden Background The major morbidity and cause of death during extracorporeal membrane oxygenation (ECMO) are related to neurological complications. Early diagnosis is important to guide further treatment. However, diagnostic methods available during ECMO are limited, especially in older children. MRI is a sensitive and reliable method for assessment of brain parenchymal changes. We have previously reported an animal experiment with MRI during ECMO. However, the use of MRI in patients during ECMO has to our knowledge never been reported. Objective We report the first successful MRI examination of a patient during ECMO treatment. Materials and methods An eight-year-old boy with proven haemolytic uremic syndrome (HUS) was admitted to the paediatric intensive care with sepsis and ARDS after operation of an intussusception and bowel necrosis. Progressive cardiopulmonary insufficiency necessi-

Abstract Infiltrating lipomas are seen more frequently after 30– 40 years of age. They are uncommon in children. Only few pediatric cases have been described in the literature. Infiltrating lipomas have congenital and acquired forms. The congenital form is typically seen before 2 years of age. In this paper we describe three pediatric congenital infiltrating lipomas with localization of face, trunk and foot. Report We report a 6 month-old girl with a soft mobile mass on her cheek causing facial asymmetry and ptotic lip, a 1 year old boy with a soft mass on his left foot which had been growing since his birth and a 1 year old boy with a soft mass on his left paravertebral space. The masses were mobile and ill-defined. For each cases MRI were carried out. MRI showed that the lesions had lipom-like signal intensity and were infiltrating the adjacent structures. Surgical decompression were performed. Histopathologic examinations revealed mature adipose tissue without any nuclear atypia. On the routine controls the rest of lipomas were observed without any change in size. Discussion MRI is the best imaging technique to diagnose soft tissue tumors. We can easily observe the homogenous fatty tissue invading the adjacent structures as a common feature of the infiltrating lipomas in our cases. But only clinical examination or MRI can not be reliably to differentiate lipoma, liposarcoma and lipoblastoma. To diagnose the lipoma histolopathological examination is usually required. Finally infiltrating lipomas should be included in the differential diagnosis of soft fatty tissue tumors in childhood although they were common in adults. We also found out that MRI was the best imaging modality to establish the infiltrating pattern of the tumors and to insure satisfactory outcome on the follow-up in our cases.

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The imaging features of fibrous dysplasia of the head and neck in children: A pictorial essay Harvey EL Teo, Wilfred CG Peh, Kok Chye Tan KK Women’s and Children’s Hospital, Alexandra Hospital, National University Hospital

Evaluation of workflow in a pediatric radiology department using ultra low dose digital imaging system M Alison, R Azoulay, B Tilea, S Grandjean, T Lefevre, I Achour, G Sebag Hôpital Robert Debré, AP-HP, Paris VII University

Fibrous dysplasia is a benign localized bone disorder of unknown aetiology which may affect one or more bones. Endocrinopathies, abnormal pigmentation of the skin and mucous membranes are often associated with the disease. Fibrous dysplasia involving the head and neck often produces marked cosmetic and functional complications due to cranial nerve compression. This pictorial essay will illustrate the wide range of various presentations and radiological appearances of this entity as seen on different imaging modalities such as plain radiographs, computerized tomography and magnetic resonance imaging.

Background A new Ultra Low Dose digital imaging system (EOS, biospace med, Paris) allows simultaneous AP and LAT direct acquisition of whole or partial body images, of a patient in an upright or seated position, favorable for musculoskeletal examinations. The dose is 5 to 10 times lower than currently used systems. Objective The aim of this study was to evaluate the workflow of this Ultra Low Dose digital imaging system in a pediatric radiology department. Materials and methods 100 patients with a mean age of 13.3 years (SD=3.5 years, range 4–19 years) undertook an EOS examination. Acquisitions were performed by one technician only. The study included full body, full spine, lower limb, chest, pelvis, knee, shoulder and extremity acquisitions. Examination time was recorded and compared to the existing literature. Examination Time was recorded from the arrival of the child and ended when images were sent to PACS. Results Mean examination time was 3 min and 40 s for full body, full spine and lower limb, and 2 min and 30 s for the other investigated areas. Comparison with available literature showed that EOS provides better workflow than CR and equivalent or better than DR. Time gain is particularly high for long length examinations since the image is acquired in one single scan. Conclusion Ultra Low Dose Radiology improved the workflow in a paediatric radiology department. Spine and lower limb examinations could be performed in less than 4 minutes.

P76 MRI or scintigraphy,which is better for musculoskeletal infections in children? Hayder Hashim, Pranav Vyas, Caroline Rassbach, Edward Fink Children’s National Medical Center Background Osteomyelitis is an infection of the bone and marrow that usually results from bacterial infection. In the pediatric population, the hematogenous spread of infection is the most common route. Osteomyelitis is a serious disease which can cause long-term disability in children. Increased microbial resistance and a costconscious health care environment make prompt diagnosis essential. Though diagnosis and early treatment of osteomyelitis are important, the sometimes non-specific presentation of this disease, especially in younger patients, presents a challenge both to the clinician and to the radiologist. In this poster, we will present cases of osteomyelitis from our institution using a variety of modalities, with emphasis on skeletal scintigraphy and magnetic resonance imaging (MRI). Starting in April 2008, our hospital adopted a new framework (the Musculoskeletal Infections Pathway) that utilizes early MRI for diagnosis of osteomyelitis. We will compare the effectiveness of the previously most common diagnostic modality, scintigraphy, with MRI. Objective To demonstrate various radiological findings of osteomyelitis, as well as the superiority of MRI compared to scintigraphy in diagnostic efficacy for osteomyelitis. Materials and methods Over a 6 month period before and after the implementation of the Musculoskeletal Infections Pathway, images were retrospectively reviewed; MRI findings were compared with skeletal scintigraphy. Results Out of (52) cases included in this review, we will illustrate the imaging findings in (12) of these cases, emphasizing common findings as well as pitfalls in the diagnosis of osteomyelitis. Conclusion Multiple imaging modalities can be used in the diagnosis of osteomyelitis and related soft tissue infections. MRI appears promising as the best imaging modality for early diagnosis of this important entity.

P78 A pictorial review of the radiology and differential diagnosis of metaphyseal. Abnormalities in children S Harave, K Taylor-Robinson, C Farrell, C Landes Alder Hey Children’s Hospital, UK Background The metaphyses are the most vascular and active part of the growing long bone and as such they are affected by various systemic and local diseases. There are a variety of manifestations of these diseases and some appearances are pathognomonic while others have a wider differential diagnosis. Common conditions such as Rickets and trauma will be included whilst other rarer pathologies such as congenital Rubella and metaphyseal dysplasias will also be discussed. Objective We aim to present a pictorial review of the varied appearances of the metaphyses in children seen at a tertiary children’s hospital. > A brief description of the pathologic process responsible for these > appearances will be included Conclusion Knowledge of the radiological appearances of metaphyses is invaluable in assessing radiographs of long bones and skeletal

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surveys in children and can be diagnostic. Awareness of the background pathologic process responsible for these appearances will aid in the differential diagnosis.

P79 A case with proximal femoral focal deficiency and fibular agenesis Gulten Coskun, Melda Apaydin, Aysegul Sarsilmaz, Makbule Varer, Engin Uluc Izmir Ataturk Egitim ve Arastirma Hastanesi, Turkey Objective We report a case of bilateral proximal femoral focal deficiency (PFFD) together with fibular aplasia associated with unilateral undescended testis and bilateral inguinal herni. Some congenital anomalies involving face, gastrointestinal, skeletal and urogenital system, heart, lung and diaphragma associated with lower limb malformations have been described in the literature. Materials and methods The male infant is the first child of healthy nonconsanguineous parents. Family history and pregnancy were unremarkable. There was no history of maternal diabetes or exposure to any teratogenic agent during the pregnancy. Physical examination revealed a shorter right lower limb compared to the left. Bilateral upper extremity and face were normal. Radiographic examinations showed marked hypoplasia of the proximal 3/4 portion of the right femur and no absent acetabuler component. There were bilateral fibular, patellar agenesis and rotastion anomalies. The foot radiographs revealed tarsal agenesis, two metatarsal bones and phalanges, four metatarsal bones and phalanges on the left. There was no pathology on chest roentgenograms. Results and conclusion The application of open reduction and relaxastion operation for with PFFD of the right hip in four month man is described. When he was five rotation osteotomy for left foot wrist and walking ortesis for right lower extremity were applied. He started walking at the age of 5. Proximal femoral focal deficiency is a rare malformation of the lower limbs that involves the femur and acetabulum in varying degrees. Its etiology is multi-factorial, comprising cellular malnutrition, drug ingestion, vascular abnormality, and intra-uterine arterial compression. PFFD can be unilateral or bilateral and is associated with musculoskeletal defects distal to the femur such as fibula hemimelia and clubfoot. Urogenital anomalies that can be associated with PFFD are described as hypospadias, cryptorchidism, small penis, vaginal septum, double uterus, vesico-ureteric reflux, ectopic ureteric orifices, and pelvi-ureteric obstruction. P80 MR imaging findings of a hibernoma of the wrist: A case report Ayca Akgoz, Murat Canyigit, Ali Koksal, Okan Akhan Bayindir Hospitals, Ankara, Turkey Background A 14-year-old girl with a history of painless subcutaneous mass in her left wrist for one month. Objective To present magnetic resonance imaging findings of hibernoma with a very unusual location.

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Materials and methods Left wrist magnetic resonance imaging was performed with a 1.5T GE Signa EXCITE scanner using knee coil. Following sequences were acquired; coronal T1W,fat-saturated T2W, gradient-echo, transverse T1W, fat-saturated T2W, sagittal fatsaturated PDW, coronal 3D Fiesta, transverse fat-saturated T1W and coronal fat-saturated 3D T1W and following contrast administration transverse fat-saturated T1W and coronal fat-saturated 3D T1W. Results Physical examination revealed an immobile, painless leftsided wrist mass without any neurologic symptoms. Laboratory tests are within normal range. MR imaging depicted a lobulated, welldemarcated left-sided wrist mass located on the volar ulnar side, with a size of 25×12×23 mm, demonstrating intermediate signal intensity on T1W images and high signal intensity on T2W fat-saturated images and showing intense enhancement on postcontrast images. The mass was excised completely and the histopathologic examination showed that it was a hibernoma. Conclusion Hibernoma is a a rare benign tumor of brown fat origin. Hibernomas seem to form in the areas with remaining brown fat, such as the scapular region, neck, axilla, chest wall, mediastinum, perirenal areas, thigh, buttock, popliteal fossa, scalp, breast, periureteric region, and scrotum. The presented case showed that hibernoma should be considered in the differential diagnosis of benign tumors which are clinically slow-growing, painless and subcutaneously located. P81 Imaging approach to soft tissue lumps in pediatric patients MG Papadaki, H Moschouris, E Bouma, C Hadjigeorgi, D Matsaidonis Department of Radiology, “Tzanion” Hospital of Piraeus, Greece Background Soft tissue lumps is a common indication for US in children. Normal structures are usually easily depicted but when a mass is present, its US characteristics may contribute significantly to the correct diagnosis. MRI should be performed when diagnosis is obscure. Objective The aim of this study is to present normal anatomical structures and variants that can mimick soft tissue masses in children, to highlight the role of ultrasonography (US) as the first imaging modality in the evaluation of soft tissue tumors and to emphasize the importance of MRI in doubtful cases. Materials and methods In most cases US can confirm confidently the presence of a mass. It can distinguish between cystic and solid lesions, depict the tumor echo-structure and inform about its relationship with surrounding tissues. Pattern of vascularity adds valuable information. MRI is performed in doubtful cases, when extent of the lesion is difficult to define or malignancy is suspected. Results US usually proves sufficient for the diagnosis of bifid ribs, asymmetric costal cartilages and subcutaneous fat in children as well as for the diagnosis of common benign masses (cellulitis, lipoma, abcess, haematoma, fibromatosis coli, Baker’s cyst, ganglia). Infantile haemangioma, venous haemangioma, A-V malformation and lymphangioma present with specific US features. MRI is used to define the extent of the lesion or where a soft tissue sarcoma is suspected. Conclusion US is the initial imaging method of choice for the evaluation of soft tissue lumps in children. It can often provide a specific diagnosis, especially in benign conditions. MRI adds informations in selected cases.

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P82 Spondyloepiphyseal dysplasia (Case report) K Urbanek, J Gyarmati, J Barna Huniko Diagnostic Center Pest County Hospital Background We describe the radiological and clinical findings in a 5 years old boy with spondyloepiphyseal dysplasia(SED).We examened before and after operation. Objective We wanted to determine the diagnostic value of MRI and MRA in this case of SED Materials and methods We followed up this child form birth until the age of 5. Spinal deformity, hip deformity, later neck instability, carotis interna disorder were diagnosed.X-ray, MRI and MRA was used before and after surgery. Results SED is a very rare disorder.We discribe the radiological findings,pathophysiology, morbidity, clinical history, and causes of SED. Also we speak about the differential diagnosis and treatment. In our case there were arteria carotis interna abnormality too. The follow up examinations showed neck instability and he was operated on. Since the operation the weight and hight of the children has benn growing(high 10 cm in 1 year) Conclusion The diagnosis and follow up examinations based on radiological findings. In case of neck instability the method of choice is MRI. Also important to do MRA examintaion because of the possibility of the carotis and vertebralis disorders. These patients use to have a lot of examintaions, so it is important to reduce the X-ray radiation doses ,so MRI is very usefull in follow up examinations. P83 Osteopenia of prematurity: Pathophysiology and radiological features K Taylor-Robinson, S Harave, C Landes Alder Hey CHildren’s NHS Foundation Trust, UK Background Osteopenia of prematurity is an important condition with a high prevalence in babies of low birth weight becoming more frequent with increasing prematurity. The condition is also termed metabolic bone disease of prematurity and includes the more specific condition of neonatal rickets. Presenting 6–12 weeks after birth there may be fractures, radiological signs of osteopenia or rickets, and abnormal bone biochemistry. The etiology of osteopenia of prematurity is complex and multifactorial. Risk factors include: gestation less than 28 weeks; birth weight less than 1,500 g; prolongued TPN >4 weeks; exposure to steroids or diuretics; and periods of immobilisation. Objective We present an educational exhibit on Osteopenia of Prematurity highlighting the contributing pathophysiology and radiological findings. Materials and methods We reviewed the radiology of at risk patients, with 2 or more risk factors, that were in patients in a large specialist neonatal unit for a 12 month period from June 2007 to June 2008.

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We present our findings, including the number and type of fractures, and use examples to demonstrate the features of osteopenia of prematurity. The presentation of osteopenia of prematurity can coincide with discharge from the neonatal unit and as such the presence of multiple fractures can raise concerns regarding non-accidental injury, a known risk following premature birth. We highlight the differences in the typical findings whilst acknowledging that neither diagnosis can be made on radiological features alone. Conclusion Familiarity with the risk factors and presentation of osteopenia of prematurity is essential for those radiologists who report neonatal radiographs. This exhibit gives a rapid overview, arming the paediatric radiologist with the key information to make their assessment. P84 Chronic recurrent multifocal osteomyelitis (CRMO): A review of imaging findings in 21 patients Céline Falip, Chantal Job-Deslandre, Nathalie Boutry, Anne Cotten, Catherine Adamsbaum Université Paris Descartes, St Vincent de Paul Hospital (AP-HP) CHRU Lille Background CRMO is a rare inflammatory bone disease of unknown aetiology occurring mainly in children and adolescents. It may be difficult to distinguish CRMO from other bone diseases such as bacterial osteomyelitis or primary bone tumours. Diagnosis of CRMO is often delayed. Objective To review typical and atypical imaging patterns in order to prevent misdiagnosis and therefore, to avoid unnecessary invasive procedures or prolonged antibiotic therapy. Materials and methods We retrospectively reviewed clinical and imaging (X rays, CT, scintigraphy and MRI) findings of 21 children with CRMO. Diagnosis was based on the following criteria: (1) age under 18 years, (2) two different sites (at least) of bone involvement or one site associated to a fluctuating course with at least 2 recurrent episodes of pain and (3) surgical biopsy to exclude infectious and tumoral processes. Results The sex ratio was 2/1 (14 girls and 7 boys) and the age range 3–18 years. The disease was multifocal in 17 patients. Appendicular skeleton was involved in 19 patients: tibia, femur, humerus and radius were primarily affected, mainly at the metaphyseal sites. Involvement of epiphysis or diaphysis was rare. Axial skeleton, mostly clavicle and spine, was involved in 8 patients. Radiographs and CT demonstrated the typical pattern of combined osteolysis and osteosclerosis in half of the study group. In the other half, osteosclerosis only or osteolysis was present. Hyperostosis was a common finding. MRI showed in all patients bone marrow oedema and adjacent soft tissue edema was frequent. No abcess formation was seen. Whole-body-MRI (STIR sequences) was always more contributive than scintigraphy to detect metaphyseal abnormalities. Conclusion Imaging patterns in CRMO are quite characteristic. However, atypical features deserve attention and whole-body-MRI seems very pertinent to detect silent lesions.

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P85 Bony and pulmonary eosinophilic granuloma: CT evidence of lesion evolution C Lanza, G Pieroni, V Bolli, B Fabrizzi, G Fabrizzi Azienda Ospedaliero-Universitaria Ospedali Riuniti, Italy Background Eosinophilic granuloma (EG) is the most common and benign form of a rare proliferative disorder: Langerhans’ cell histiocytosis. It commonly affects children. Objective To present the clinical features, radiographic findings and management of 7 pediatric patients with bony and pulmonary EG. Materials and methods Between 2002 and 2008, 7 patients who initially presented with localized pain and soft tissue swelling or stiffness of the back were admitted to our hospital. Bone radiographs, CT scans of the involved bone and in 4 cases MRI too, were performed. All had chest CT and bone biopsy. The scans were repeated at intervals of six/ eight months. Results There were 5 boys and 2 girls (mean age: 8 years; range 3– 14). Radiographs and CT bone scans revealed bony destruction or lytic lesions localized: in first metatarsal (1), in pelvis (2), in spine (1 cervical and 1 lumbar vertebra), in sternum (1) and femore (1). Four patients had association of bony lesion with extended asymptomatic pulmonary involvement: chest CT scans showed nodular lesions and thin-walled cysts, but the nodular lesions disappeared or were transformed into cystic lesions in the later scans. Most of the final scans revealed thin-walled cysts and emphysematous lesions. Histological examination of the bone biopsy showed features of eosinophilic granuloma with aggregates of Langerhans histiocytes. Conclusion EG is a rare intrinsically benign disease producing a destructive tumor with a variable clinical presentation and an often unpredictable clinical course . Bone involvement is generally observed in children mostly boys. Chest radiography and CT findings of EG are characteristic and vary with the stage. The lung disease led to the initial diagnosis and optimal surgical, pathological and radiological management. P86 Observations by MRI, proton MRS and DWI in glutaric aciduria type-1 Mehmet Atalar1, Dilara Icagasioglu2, R. Nuri Sener3 1. Department of Radiology, School of Medicine, Cumhuriyet University, Sivas, Turkey 2. Division of Pediatric Neurology, School of Medicine, Cumhuriyet University, Sivas, Turkey 3. Department of Radiology, School of Medicine, Ege University, Izmir, Turkey Background Glutaric aciduria Type 1 (GA-1) is a recessively inherited inborn error of metabolism characterized by the deficiency of the mitochondrial enzyme Glutaryl CoA dehydrogenase (GCDH) which catalyzes the dehydrogenation—decarboxylation of Glutaric acid, an intermediary metabolite in the degradation pathway of lysine,

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hydroxy-lysine and tryptophan. Bitemporal arachnoid cysts and macrocephaly are the most common features of infants and children with GA-1. Objective To review the imaging features of GA-1 in a group of seven child patients. Materials and methods Clinical history and findings and brain MRI, proton magnetic resonance spectroscopy (MRS) and diffusionweighted imaging (DWI) results in 7 patients were reviewed. Results The most common clinical presentation was encephalitis-like episode. Age at the time of the diagnosis ranged between 6 and 24 months. Male to female ratio was 2/5. In all the patients macrocephaly, brain atrophy or hypoplasia, white matter changes, open opercula (usually very widely open), and wide cerebrospinal fluid spaces anterior to the temporal lobes were present. Basal ganglia lesions, presenting as volume loss and high T2 signal intensity in the lentiform nucleus bilaterally, were found in 100%. In one of the patients bilateral subdural hemorrhages were demonstrated. The MRS showed decreased N-acetyl-aspartate (NAA)/creatine (Cr) ratio and increase in choline (Cho)/Cr ratio. In addition, there was prominent lactate (lac) peak at 1.33 ppm. In DWI, we observed widespread restricted diffusion in the white matter and increased diffusion in bilateral putamen. Conclusion The finding of very widely open opercula suggests GA-1, and if combined with basal ganglia lesions is almost pathognomonic, especially in a child with macrocephaly. While conventional MR imaging plays an important role in determination of morphologic changes, functional information in areas of the brain involved can be provided by proton MRS and DWI. P87 The role of MR-imaging in children with primary solid tumors and CNS hematogenous brain metastasis L Porto, A Jarisch, M Kieslich, FE Zanella, R Du Mesnil Klinikum der Johann Wolfgang Goethe-Universität, Germany Objective To characterize the incidence and MR-findings of haematogenous brain metastases among children with solid tumours. Materials and methods Among 429 patients with solid tumors during the period of 10 years, 4 eventually developed brain metastases. Patients with lesions secondary to direct extension from the skull or dura were excluded. MR characteristics studied of the brain metastasis included location, signal intensity, enhancement pattern, the presence of intratumoral haemorrhage, as well as the presence of secondary hydrocephalus or leptomeningeal spread. Results Of the 429 children with solid malignant tumors included in this study, 4 (0,9%) developed solitary brain metastasis. The solid primary tumours were nonsmall cell lung carcinoma, Wilm’s tumour, Osteosarcoma und Hepatoblastoma. The mean time from initial diagnosis to the detection of brain metastases was 8, 5 months. All patients but one-nonsmall cell lung carcinoma- had known lung metastases. Brain metastases in children can have different sizes (mean size: 14 mm) and show perifocal oedema when associated with bleeding. All tumours were subcortical/cortical based and isointense with grey matter on unenhanced T1-weighted images and in two cases

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mildly hyperintense on T2-weighted images. Two patients showed restriction on diffusion-weighted images (DWI). Three out of 4 patients showed enhancement; two nodular- and one ringenhancement. In the patient with osteosarcoma the metastasis was calcified. Conclusion Solitary brain metastasis was the rule with variable MRcharacteristics. Although brain metastases are rare in children, they have grave prognosis. But CNS metastasis is not in itself a terminal event; metastasis in patients with Wilm’s tumor might behave differently. We suggest MR routine imaging studies as part of metastases screening and by the time of tumor recurrence, especially in patients with solid tumors and recurrent or prior lung metastasis, even if the child shows no neurological changes. P88 Progression of foci of altered signal intensity in neurofibromatosis von recklinghausen type 1 prevails over their regression only during puberty Jiří Lisý1, Bořivoj Petrák2, Martin Kynčl1, Josef Kraus2, Václav Śimonovský1, Marie Kalužová2 1. Department of Imaging Methods, University Hospital Motol, Prague 5, 150 16V úvalu 84, Czech Republic 2. Department of Child Neurology, University Hospital Motol, Prague 5, 150 16V úvalu 84, Czech Republic Background Foci of altered signal intensity (FASI) are the most common CNS involvement in neurofibromatosis von Recklinghausen type1. Progression of FASI during childhood, followed by their regression after puberty had been described previously. Objective The aim was to follow progression/ regression of FASI in NF1 in different age groups and different brain structures. Materials and methods Authors retrospectively evaluated development of FASI on the brain MRI in 200 NF1 patients. Groups of patients were defined according to patients age in time of examination. Groups of patients were imaged during childhood (below 10 years), between childhood and puberty, during puberty (10–14 years), between puberty and juvenile age and after puberty (more than 14 years). Results FASI involved 165/200 (82.5%) NF1 patients, 126 of them were followed up. Progression/regression ratio of FASI was 79/100 during childhood, 23/46 between childhood and puberty, 32/27 during puberty, 11/56 between puberty and juvenile age and 12/46 during juvenile age. Conclusion Regression of FASI prevails from the first examination during childhood till puberty and it is even accentuated after puberty. Progression of FASI was seen only during puberty.

P89 Pictorial essay of neurocutaneous melanosis—Experience in a paediatric hospital Leysia Chu, Manohar Shroff, Charles Raybaud The Hospital for Sick Children Background Neurocutaneous melanosis is a rare phakomatoses of the skin and leptomeninges.

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Objective To review MR findings of neurocuatneous melanosis; to evaluate whether multiplicity of skin lesion is a risk factor for CNS involvement Materials and methods MRI of all patients with diagnosis of giant/ multiple congenital melanocytic naevi referred for evaluation of CNS involvement in a paediatric hospital were retrieved for detailed review. Retrospective chart review was performed to examine the extent of cutaneous involvement. Multiplicity was defined as presence of 3 or more cutaneous naevi in physical examination. CNS involvement was defined as abnormal T1 hyperintensities and/or leptomeningeal enhancement in MRI brain or spinal cord using a 1.5 Tesla magnet. Other associated findings were documented. Results A total of 25 complete MRI studies of neuraxis were available for review in the imaging database. There were 16 males and 9 females, age ranged from 5 days to 13 years old (median= 9 months old). Twelve of the 25 patients had CNS involvement, among those 9 had multiple naevi. For those with only 1 or 2 pigmented naevi, only 3 out of 13 had CNS involvement. Three patients had T1 hyperintense lesions in the brain, 4 patients had leptomeningeal enhancement in spinal cord, 3 had leptomeningeal enhancement in brain and spinal cord. Two other patients had both T1 hyperintense lesions in the brain and leptomeningeal enhancement in the spinal cord. Chi square test showed a highly significant association between multiplicity of skin lesions and CNS involvement (6.74, p value of 0.009 with 99% C.I.). Conclusion MR imaging is an essential part of the evaluation for patients with giant/multiple congenital melanocytic naevi. Limited set of patients with multiple skin lesions appear to have a 3-fold increase in risk for neurocutaneous melanosis. This further supports and estimated the relative risk of CNS involvement. P90 A case of posterior reversible encephalopathy syndrome (PRES) and “acquired chiari I” in a patient with Prader Willy syndrome (PWS) B Bernardi1, R Bergamaschi2, R Sciutti3, E Galassi4, M Zucchelli4, A Cicognani2 1. Pediatric Radiology, Bellaria Hospital, Bologna 2. Department of Pediatrics, S. Orsola-Malpighi Hospital, University of Bologna, Italy 3. Pediatric Radiology, S. Orsola-Malpighi Hospital, University of Bologna, Italy 4. Pediatric Neurosurgery, Bellaria Hospital, Bologna, Italy Background Prader Willi (PWS) is a very rare genetic disorder characterized by hyperphagia, obesity, small stature and learning difficulties. Posterior reversible encephalopathy syndrome (PRES) is a clinicalneuroradiological entity, potentially reversible and usually presenting with acute or subacute headache, altered mental status, vomiting, seizures, and occipital lobe related symptoms. Magnetic Resonance Imaging (MRI) shows: cortical and subcortical white matter edema of the parieto-occipital lobes, and other cerebral structures, such as the basal ganglia, frontal lobes, cerebellum, and brainstem. Acquired tonsil herniation, so-called “acquired Chiari I”, may occur secondary to CSF hypotension, raised intracranial

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pressure (IP) or venous hypertension (VH). Case report A 7 year-old-boy, with a history of PWS, hyperthophicdilatative cardiomyopathy, arterious hypertension and renal cystic dysplasia, presented with asthenia, headache and extreme blood hypertension (BH). On admission, a brain CT showed small ventricles, multiple and symmetric hypodense cortical and subcortical areas, involving both of the cerebral hemispheres. The MR showed multiple areas of T2 hyperintesity and corresponding T1 hypointensity, prevailingly subcortical but also involving the cortex. The MRA and MRV were normal. DWI showed vasogenic, rather than cytoxic edema. The cerebellum was less affected but, likely due to raised IP, downward displacement of the cerebellar tonsils into the foramen magnum was evident. The child underwent a suboccipital decompression. The follow up MRI showed complete resolution imaging abnormalities. Clinical and imaging manifestations reversibility confirmed the diagnosis of PRES secondary to acute high blood pressure. Discussion and conclusion To our knowledge, we first describe a case of PRES in PWS with associated cerebellar tonsil herniation requiring urgent decompression. In absence of a previously diagnosed Chiari malformation, we can suppose that brain edema, observed during acute BH, resulted in ICH and tonsil herniation. Pathophysiology of PRES, particularly in the presented case, is debated. P91 Proton MR spectroscopy in the evaluation of functional and structural reorganization of brain in children with cerebral palsy—Initial report Monika Bekiesinska-Figatowska, Hanna Bragoszewska, Jerzy Walecki, Krystyna Szymanska, Anetta Jeziorek, Tomasz Mazurczak, Jolanta Tryfon, Anna Romaniuk-Doroszewska, Elzbieta Jurkiewicz, Boguslawa Biernacka Institute of Mother and Child Background The injury of the connections between the cortex and other parts of the central nervous system leads to the physical disability of cerebral palsy patients. Thanks to the plasticity of the brain rehabilitation may cause reorganization of the cerebral cortex thus enabling clinical improvement. Objective To present the results of 1HMRS in children with cerebral palsy as a basis for evaluation of brain reorganization after one year of rehabilitation. Materials and methods Material consists of 56 children (34 m, 22f), aged 2,2–15,7 years, divided into 5 subgroups: (1) right- (n= 11) and (2) left (n = 7) hemiplegia, (3) diplegia (n = 19), (4) quadriplegia (n=14), (5) other/unclasified (n=5). Control group consists of 61 children (33 m, 28 f), aged 1,5–18,2 years. So far six children have been examined after 1 year of rehabilitiation. Nacetyloaspartate, choline and myoinositol ratios to creatine were obtained symmetrically in the cortex of frontal lobe, frontal operculum, temporo-occipital junction and in the basal ganglia. Statistical analysis was performed using Mann-Whitney, t-Student and Wilcoxon tests (p<0.05). Results Comparison of the ratios was performed in the analyzed group between the right and left hemisphere. This group was also compared to the control group. The most statistically significant

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differences were found in: 1) the NAA/Cr ratios, 2) the clinical group 4, 3) the basal ganglia. In the follow-up examinations no increase in NAA/Cr ratio has been found so far. Conclusion Statistically significant differences between analyzed and control group were the most pronounced in clinical subgroup 4. This may reflect the most severe brain injury in this group in our material. Paradoxically these differences were found mostly in the basal ganglia and not as expected in the cerebral cortex. Obtained initial results do not indicate the expected spectroscopic improvement in the rehabilitated patients and require further analysis in bigger material. P92 Neonatal spinal ultrasound: Normal appearances and pictorial review of pathologies encountered S Stafrace, KA Duncan Royal Aberdeen Children’s Hospital Background Spinal Ultrasound is the first line investigation in infants suspected of having congenital abnormalities of the cord at birth. Objective To illustrate the range of normal appearances of the spine at birth and provide a pictorial review of the spectrum of abnormalities encountered. Materials and methods Cases referred to our institution for spinal ultrasound over the last 5 years were reviewed. Results As well as the normal range of findings, abnormal entities which will be illustrated include tethered cord, abnormal filum terminale, dorsal dermal sinus, meningocoele, myelocystocele, diastomatomyelia, hydromelia, and sacrococcygeal teratoma. Conclusion Our exhibit will help provide familiarity with normal and abnormal appearances encountered on spinal ultrasound. P93 MRI of the paediatric inner ear structures Maria-Lena Gregoriades, Kaseem Ajilogba Royal Hospital for Sick Children, Edinburgh Background There is an increasing demand for MR imaging of the paediatric ear structures in children with deafness, speech and language developmental delay and phonological disorders. In addition to the assessment of the inner ear structures, we provide a full set of three separate sequences and orthogonal planar assessment of the brain. Objective To determine if a full set of brain imaging should be an essential part of the MR imaging of the paediatric inner ear structures. Materials and methods A retrospective review of MR examinations of the paediatric inner ear structures over a 12-month period (June 2007–May 2008) was performed. The indications for the examinations, scanning technique, and abnormal radiological findings were analysed. In the case of a brain parenchymal abnormality, the sequence on which it was most apparent was also recorded. Results There were 22 patients (aged 1–14 years, mean 7.5 years;

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15 males: 7 females). The main indications are sensori-neural hearing loss with14 patients (63.6%) and phonologic disorder with developmental delay 2 (9%). All patients had structurally normal inner ear, 6 (27.3%) had brain parenchymal abnormality of which 5 (22.7%) were significant and 1 (4.5%) was a normal variant. Of the 14 patients with sensori-neural hearing loss, 2 (14.3%) showed periventricular leucomalacia, 12 (85.7%) had no brain parenchymal abnormality. The other significant parenchymal findings are congenital cytomegalovirus infection, not specified leucodystrophy and neurofibromatosis. Conclusion A full set of brain imaging should not be an essential part of the assessment of the paediatric inner ear structures. P94 Interest of MRI in the prenatal detection of associated brain anomalies in fetuses diagnosed with isolated cleft lip with or without cleft palate Mn De Milly, N Belarbi, E Vuillard, P Oger, Jf Oury, M Elmaleh, G Sebag Hopital Robert Debre Objective To determine the interest of a systematical MRI to detect associated brain anomalies in fetuses diagnosed with isolated cleft lip with or without cleft palate. Materials and methods Retrospective study of 91 cases of fetuses prenatally diagnosed facial with cleft lip with or without palate, between 1993 and 2008. .Absence of associated anomaly was checked by ultrasound performed by a trained specialist. Brain MRI was done systematically. Were differentiated fetuses with isolated cleft lip from cleft lip with cleft palate, and unilateral from bilateral forms. The cleft and its type were checked after birth. Results Significant associated brain anomalies were detected by MRI, in 2 of the 80 cases selected after ultrasound. One case was a fetus with a unilateral cleft lip with cleft palate and the other case was a bilateral cleft lip with cleft palate. Conclusion The interest of performing a MRI after normal ultrasound is proved. But 2 in 80 cases is not significant statistically. To perform a systematical MRI is a choice.

P95 Imaging in paediatric epilepsy—A pictorial review V Godhamgaonkar1, S Harave1, R Harrison2 1. Royal Liverpool Children’s Hospital NHS Trust, Alder Hey, Liverpool 2. Queen Alexandra Hospital, Portsmouth Hospitals NHS Trust, Portsmouth Background Diagnosing and treating paediatric epilepsy is challenging. We present a comprehensive pictorial review of various etiologies presenting as seizures or epilepsy in children. Although imaging is not routinely indicated following a simple febrile convulsion, it is vital in the assessment of children with a focal neurological deficit,

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developmental delay, neurocutaneous syndromes, simple and refractory complex partial seizures etc. Objectives After reviewing this poster, the delegates will be able to1.

Enumerate various pathologic conditions manifesting as seizures and their imaging findings. 2. Discuss the role of MRI in diagnosing structural abnormalities in paediatric epilepsy. Materials and methods We have attempted to include MR imaging of wide spectrum of disorders presenting as acute onset seizures with neurological symptoms such as infection, hemorrhage, tumour, suspected NAI etc. We have emphasized the crucial role of detailed MRI examination to reveal structural abnormalities in chronic seizure disorders or refractory epilepsy. Temporal lobe epilepsy, mesial temporal sclerosis and focal cortical dysplasia are some such entities. We have included a brief pictorial description of various developmental disorders e.g. scizencephaly, polymicrogyria, hemimegalencephaly etc., neurocutaneous syndromes, metabolic disorders, congenital infections, hypoxic ischemic encephalopathy etc. A few of the childhood neoplasms like DNET, giant cavernoma etc. have been included. To conclude, we have briefly touched upon the role of SPECT and PET, functional MRI and spectroscopy etc. in the imaging work up of patients with option of possible curative surgery. Conclusion We intend to provide the delegates a pleasant learning experience through this well presented, educational pictorial tour.

P96 The value of the color doppler ultrasonography in differentiation of benign subarachnoid spaces dilatation from subdural collection in infants Xinyu Yuan, Yingzi Su Capital Institute of Pediatrics, China Background It is important to differentiate the benign subarachnoid spaces from subdural collection in children Objective To differentiate the benign subarachnoid spaces dilatation from subdural collection in infants with color Doppler US. Materials and methods 27 case with paricerebral fluid collection were reviewed retrospectively. Among them, 14 cases with purulent meningitis were confirmed as subdural collection by subdural centesis and 13 patients with benign subarachnoid spaces dilatation diagnosed by MR. Color Doppler US images of these patients were reviewed focus on the inner margin and distribution of collections and vascular sign. Results In the group of subdural collection (14 cases), 10 (71.4%) were unilateral and 4 were bilateral. On the contrast, only 1 cases (7.6%) with benign subarachnoid spaces dilatation was unilateral. Nearly almost (12/14, 85.7%) cases of sudural collections had smooth inner margin and 13 cases (100%) with benign subarachnoid spaces dilatation showed irregular, gyre-like inner margin. Vascular sign was seen in all enlarged subarachnoid spaces, but there was no cases with subdural effusion could be found the appearence. Conclusion Color Doppler US is an noninvasive, critical tool to differentiate the benign subarachnoid spaces dilatation from subdural collection in infants.

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P97 Brain CT appearances of febrile seizures in children Xinyu Yuan, Yang Yang Capital Institute of Pediatrics, China Background There were less repots about the imaging findings of febrile convulsions in children. Objective To evaluate the appearances of brain CT of children with febrile seizures, and assess the value of brain CT in child febrile convulsions. Materials and methods Brain CT images of 334 cases with febrile seizures were reviewed retrospectively. Among them, there were 211 boys and 123 girls, aged from 10 days to 7 years old. The patients in our study were divided into tow groups depend on their age. Group A, children less than 1 year old, and group B was comprised of children greater than 1 year old. The appearance of brain CT were analyzed focus on paricerebral spaces dilatation and other intracranial abnormalities. Results In our study, there were 220 cases (65.9%) could be found abnormal appearances on their brain CT. Enlarged paricerebral spaces were seen in 192 cases (59.3%), 48 cases (48/52, 92.3%) in group A and 150 cases (150/282, 53.2%) in group B. There are significant differences in visualization rate and severities of paricerebral spaces dilatation between the groups statistically. Otherwise, there were mega cisterna magna (11, 3.3%), ventricular enlargement (10, 3%) , arachnoid cysts (6, 1.8%), calcification (3, 0.9%), septum pellucidum cysts (2, 0.6%) and reduced white matter volume (2, 0.6%). Conclusion The major appearance in brain CT of children with febrile seizures is enlarged paricerebral spaces represented immature of brains. Not all patients with febrile convulsions need CT examination. P98 The value of diffusion magnetic resonance imaging in patients with cured acute lymphoblastic leukemia Melda Apaydin, Emine Dilek1, Canan Vergin1, Aysegul Sarsilmaz, Makbule Varer, Gulten Coskun, Melike Bedel Koruyucu 1. Izmir Ataturk Egitim ve Arastırma Hastanesi Radyoloji Anabilim Dalı Izmir Behcet Uz Egitim ve Arastırma Hastanesi Cocuk Hematoloji Bilim Dalı, Turkey Objective White matter lesions are the most common neurologic complications found on MR imaging that may be related to cranial irradiation, agressive chemotherapy and intrathecal methotrexate (MTX) therapy in childhood acute lymphoblastic leukemia (ALL). We aimed to document the radiologic abnormalities seen in the central nervous system (CNS) after treatment of childhood leukemia with MR imaging using standart and diffusion MR protocols. We aimed to show the advantage of diffusion MR to cranial MR. Materials and methods MR images of 29 patients with ALL were examined. Images were aquired by a 1.5 T MR by using T1-

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weighted, T2-weighted spin echo, and fluid-attenuated inversion recovery sequences and diffusion MRI . All of the patients were treated according to TRALL protocol. Seven ( 24%) of them were in high, 19 (65%) of them were in medium, 15 (51%) of them were low risk group. None of them have any acute neurological disorder. Results Twenty seven patient had no abnormality on cranial and diffusion MR. Two patients had abnormal findings. One of them had milimetric hemorrhagic brain lesion on cranial and diffusion MR. Another patient had chronic brain lesion due to previous meningitis on two different technique. Conclusion The CNS abnormalities that occur after the treatment of leukemia are related to the leukemia itself, to the treatment method, and to the duration of survival. Because many neurologic complications of leukemia are treatable, early diagnosis is essential. There was no positive impact of diffusion MR technique on cured ALL patients who did not have any acute neurological symptoms. But we can conclude that adding this modality in acute neurologic symptomatology may show some positive impact to the treatment by detecting acute ischemic changes due to venous brain infarcts. P99 Central skull base osteomyelitis in children: Presentation, imaging and complications R Singaroyan, S Rajaram, D Connolly, A Raghavan Sheffield Children’s Hospital, Royal Hallamshire Hospital, UK Background Skull base osteomyelitis (SBO) arising from sphenoidal paranasal air sinus infection without associated otitis is rare. Diagnosis relies heavily on imaging as presentation can be insidious with headache being the only feature with cranial neuropathies or long tract signs only developing later. Early diagnosis and treatment can prevent disability Objective To review the clinical and imaging features of central skull base osteomyelitis with an emphasis on MR imaging. Materials and methods We reviewed the clinical presentation, complications, CT and MR imaging in four patients with central skull base osteomyelitis. No patient had predisposing otitis media of the temporal bone. Results Clinical presentations were varied. Complications included lateral medullary syndrome, cavernous sinus thrombosis, epidural abscesses and cranial neuropathies. CT features showed no changes or very mild bone lucency with paranasal sinus opacification. The most consistent MR imaging findings were clival and petrous apex bone marrow T1 hypointensity which showed improvement following antibiotic treatment. Post gadolinium T1 fat saturation imaging was also useful to demonstrate dural enhancement and the extent of any associated soft tissue phlegmon. Conclusion Although a rare condition , knowledge of the imaging features of skull base osteomyelitis is vital in order to facilitate early diagnosis. Early intervention with appropriate treatment may then prevent or limit further complications such as intracranial extension, empyema, or death.

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P100 Sjogren-Larsson syndrome: Cranial MRI and spectroscopy findings in two patients N Cem Oren, Murat Kocaoglu, Veysel Akgun, Sabahattin Vurucu, Nail Bulakbasi Gulhane Military Medical Faculty, Ankara, Turkey Background Sjögren-Larsson syndrome (SLS) is a neurocutaneous syndrome caused by a genetic deficiency of fatty aldehyde dehydrogenase (FALDH) enzyme in lipid metabolism, inherited as an autosomal recessive trait. It is characterized by congenital ichthyosis, mental retardation, and spastic diplegia or tetraplegia. Accumulation of long-chain fatty alcohol which is detectable by chemical-shift analysis is thought to be responsible for the cutaneous and neurologic symptoms of SLS. Objective Our purpose was to characterize the cerebral involvement in SLS and to demonstrate its Magnetic Resonance imaging (MRI) and MR Spectroscopy findings. Materials and methods A 7-year and a 2-year old male, both with ichthyosis, mental retardation, and spastic diplegia, were assessed with MRI and MR Spectroscopy. Also various biochemical tests were used to identify any enzymatic deficiency. Results MRI showed periventricular lesions, low intensity on T1weighted images and high intensity on T2-weighted images at trigones of the lateral ventricles in both patients. In the first patient white matter of the frontal lobes were also involved according to late stage of the disease. 1H-MRS of these lesions in both patients revealed high lipid and low N-acetyl aspartate peaks. Fatty alcohol oxidoreductase (FAO) deficiency that is specific for Sjögren-Larsson Syndrome (SLS) has been verified biochemically. Conclusion SLS is a rare lipid metabolism disorder and should be kept in mind for the differential diagnosis of the cases with demyelination in the periventricular white matter and lipid peaks in 1H-MRS. P101 Spectrum of imaging findings in the branchial apparatus anomalies Miguel Grande Barez, Monica Rebollo Polo, Juan Julián Cuesta Pérez, Rosa María Lorente Ramos, Jose Manuel García Gómez, Araceli Muñoz Hernández Hospital Infanta Leonor-Vallecas Madrid, Spain Background An aberrant development of the branchial apparatus (BA) results in a spectrum of anomalies that includes fistulas, sinuses, cysts and craniofacial malformations. The most common complication of the BA anomalies is infection. The definitive treatment of the BA anomalies is the surgical excision. Objective 1.To review the imaging findings of the BA anomalies in children. 2. To discuss the differential diagnosis with other head and neck pediatric entities. Materials and methods We reviewed all the cases of BA anomalies seen at our Institution. With the aim of reaching a better understanding, we review the embryogenesis of the branchial apparatus and its anatomical

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implications. We illustrate the differential diagnosis showing examples of mimicking entities. Results We present a pictorial review of the different BA subtypes and their main differential diagnosis. Most branchial anomalies involve the first and second clefts. First BA anomalies usually present as a cyst, sinus, or fistula somewhere between the external auditory canal and the submandibular area. Second BA anomalies typically result in a fistula or cyst in the lower, anterolateral region of the neck. Third BA anomalies present in a similar way. Fourth BA anomalies are rare. We include cases of the Goldenhar syndrome, a craniofacial malformation related to a BA anomaly. US, CT and MRI were used for the imaging diagnosis. We present also cases diagnosed with fistulography, done through the skin opening of the fistula. Mimicking entities mainly include parotid and thymic cysts, lymphatic malformations, suppurative lympadenitis, neck abscesses and thyroglossal duct cysts. Conclusion The branchial apparatus anomalies may represent a diagnostic challenge for the Pediatric Radiologist. A full understanding of their embryonic origin is crucial. P102 Uspio-enhanced MRI after intraperitoneal injection of ferumoxtran-10 in newborn rats: A new tool for pediatric research O Prodhomme, R Azoulay, L Schwendimann, R Santus, P Robert, G Sebag Hospital Robert Debré, Paris, France Background Ferumoxtran-10 (Ultrasmall Superparamagnetic Particles of Iron Oxides, USPIO) is a new magnetic resonance contrast agent witch enhances macrophages when it is injected intravenously. The effectiveness to enhance macrophages, of an intrapertioneal injection of ferumoxtran-10, has been recently described (neonatal rats, high dose [2,400µmol/Kg]). Objective The purpose of our study was the optimization of injected dose as low as possible with the objective of 300µmol/Kg (adult animal studies). Materials and methods After a pilot study (n=27), 111 newborn rats were killed, after a saline injection or after intra-peritoneal injection of 300µmol/Kg Ferumoxtran-10 (from 2 hours to 6 days after injection), in order to measure iron concentration into either peritoneal fluid (n= 26) or plasma samples (n=85[63 + 22]). Intracellular iron uptake in liver, spleen, bone marrow, kidney and brain was assessed using Perl’s stain (n=63). The density of Prussian blue labeled cells was quantified. The signal time course of liver, spleen and bone marrow was studied in vivo on a 1,5 T MR system using a dedicated surface coil (n=22). Proton density-weighted sequences were used. Results Ferumoxtran-10 was rapidly absorbed from peritoneum. A peak of plasma iron concentration is obtained 8 h after injection. It raises a value in the range of the plasma iron concentration after an IV injection of 40µmol/Kg. Forty-eight hours after injection no Ferumoxtran-10 remained in plasma. Statistically significant negative enhancement of the liver, spleen and bone marrow was measured in correlation with the Ferumoxtran-10 plasma concentration and its cellular uptake. Conclusion Intra-peritoneal injection of 300µmol/Kg Ferumoxtran10 in newborn rats is safe, reproducible and effective to enhance

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macrophages in MRI. The pharmacokinetic profile observed promises perfusion imaging applications (short delay post-injection) and macrophage imaging applications (long delay).

P103 Phase-contrast cine MR imaging in evaluation of communication between intraventricular arachnoid cysts and neighboring CSF spaces in 11 pediatric case O Algin, G Gokalp, Z Yazici Radiology Department, Medical Faculty, Uludag University, Bursa, Turkey Background Arachnoid cysts (ACs) are classified as communicating or non-communicating according to their relation to the neighboring cerebrospinal fluid (CSF) spaces. Inadequate or non-existent communication between the cyst and the neighboring CSF spaces seems to be responsible for mass effect and progressive symptoms. Therefore, demonstration of communication between AC and the adjacent CSF space is often required if surgical therapy is contemplated. Objective To evaluate the role of phase-contrast cine MR imaging (PC-MRI) in detecting possible communications between intraventricular ACs (IV-ACs) and CSF spaces based on comparison with MR cisternography (MRC) in pediatric cases. Materials and methods The study group was consisted of 11 pediatric patients with IV-AC (age range, 6 months–10 years; mean age, 6 years) underwent PC-MRI followed by MRC after intratechal injection of 0.5 ml gadopentetate dimeglumine. The results were statistically analyzed by using the McNemar test. Results According to the MRC results, of 11 IV-ACs 6 were noncommunicating and 5 communicating. PC-MRI results were compatible with MRC findings in 8 patients. The sensitivity and specificity of PCMRI imaging in demonstrating the communication between the IV-ACs and the CSF were 100% and 50%, respectively (PPV: 63%, NPV: 100%). Conclusion Our results show that PC-MRI is a reliable method for identifying of non-communicating IV-ACs. However, any positive result for communication between an IV-AC and neighboring CSF spaces on PC-MRI should be encountered with suspicion. P104 Shaken baby syndrome (SBS): Frequency of imaging patterns through a large series Nathalie Méjean, Caroline Rey-Salmon, Catherine Adamsbaum St Vincent de Paul Hospital (AP-HP), Armand Trousseau Hospital, Université Paris Descartes, St Vincent de Paul Hospital (AP-HP) Background SBS frequently leads to death or severe morbidity. Inflicted circumstances are unknown at the time of the diagnosis. To date, signs of SBS are well described but their frequency is not specified. Objective To provide an iconographic review including the frequency of each imaging pattern. To discuss pitfalls. Materials and methods Retrospective study (2003–2008) including 73 patients with subdural hematoma on CT and medico-legal

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conclusions including revelations. The full clinical, biological, imaging data were analyzed. Results The series includes 76% of males, 75% under 6 months. Eigthy percent of patients were admitted for hypotonia or coma with seizures. Twenty-three percent of patients died. The location of the subdural hematoma was: fronto-parietal (92%) often bilateral (66%), interhemispheric (90%) and cerebellar falx (90%). Two localisations at least were almost constant (99%). The vertex was frequently involved (81%). Parenchymal abnormalities were seen on CT in 53% of patients and MRI was always more accurate. The rate of fractures was low: skull (11%) , ribs (14%), metaphysis (17%). Retinal hemorrhages were not constant (85%) and sometimes unilateral (7%). Ecchymosis (45%) were located at the sites of grabbing. Finally, in only 5% of patients, the subdural hematoma was not associated to either retinal hemorrhages, cutaneous or skeletal injuries. Early CT control (day 1–3, n=24) often disclosed an increase of the hemorrhage which helped to confirm the diagnosis of SBS in doubtful cases. The datation is not precise. Hyperacute hematomas are heterogeneous and density of chronic hematomas may spontaneously modify. Thereby, the diagnosis of age-different hematomas should take into account two different locations. Conclusion Two sites at least of subdural hematoma are almost constant in SBS. The analysis of the vertex is one clue. P105 Cranial imaging features of primary hemophagocytic lymphohisticytosis Musa Karakukcu, Ali Yikilmaz, Ekrem Unal, Ibrahim Sacit Tuna, Turkan Patiroglu, Mehmet Akif Ozdemir, Abdulhakim Coskun School of Medicine, Erciyes University, Kayseri, Turkey Background Hemophagocytic lymphohisticytosis (HLS), also called hemophagocytic syndrome, is a rare multisystem immune disorder characterized with aggressive proliferation of activated macrophages and histiocytes. Secondary HLS is much more common than the primary disease. Almost all patients die following occurrence of multiple relapses or central nervous system disease progression. Objective To evaluate cranial imaging features of HLS and define the frequency and severity of the lesions. Materials and methods The clinical and radiologic data of 9 infants diagnosed as primary HLS in Erciyes University, Gevher Nesibe Hospital between May 2005 and January 2009 have been retrospectively analyzed. All patients had cranial CT and/or contrast-enhanced MR imaging. The images were interpreted by two pediatric radiologists independently. Results All patients (5 girls, 4 boys) presented with convulsion except 2 patients who had hemiparesis and tremor of the upper extremity. The prognosis was poor that 8 of the 9 patients died during follow-up. One patient, who was alive, was recently diagnosed and under therapy. The imaging findings were normal in 5 patients. The most common finding was T2-prolongation of cerebral white matter that was seen 4 patients. Cerebellar white matter was also involved in 3 patients. There were lesions in brain stem in 2 patients. There were corticospinal tract involvement in 1 patient and laminar necrosis in 1

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patient. There were multiple nodular lesions in the cerebrum and cerebellum with ring enhancement in 1 patient and without ring enhancement in the other. Diagnostic value of CT was significantly lower than MR imaging. Conclusion Primary HLS may have characteristic cranial MRI features. Radiologists should be aware of the characteristic MRI findings which can be used as a supplementary diagnostic modality to clinical and laboratory findings of HLS. P106 MRI findings in Guillain-Barre syndrome Ali Yikilmaz1, Selim Doganay1, Sefer Kumandas2, Ertugrul Mavili1, Ibrahim Sacit Tuna1, Abdulhakim Coskun1 1. Department of Radiology, School of Medicine, Erciyes University 2. Department of Pediatric Neurology, School of Medicine, Erciyes University Background Guillain-Barre syndrome (GBS) is an acquired demyelinating neuropathy characterized by sudden onset ascending progressive muscle weakness, hyporeflexia and elevated levels of protein in the cerebrospinal fluid. Objective To describe the spinal MRI features in children with GBS. Materials and methods Data of 32 children who had a final diagnosis of GBS since 2002 was retrospectively reviewed. MR images (32 spinal and 18 cranial MRI) were evaluated by two radiologists independently and graded with respect to severity of the involvement. Results The mean age of the study group was 5.7 years (range, 1– 15 years) including 19 boys and 13 girls. Ten patients had history of upper airway infection and 6 had history of gastroenteritis prior to the onset of the disease. The mean duration of the symptoms was 5.5 days (range, 2–22 days) and the mean recovery time was 7.5 days (range, 3–21 days). Twenty patients had electromyogram and 18 of them revealed findings consistent with GBS. Twenty-nine patients had albumino-cytologic dissociation. Thirty patients were treated with IVIG, and 2 with plasmapheresis. All but 2 patients had thickening and contrast enhancement of nerve roots and cauda equina on spinal MRI. The enhancement was mild in 13 patients, moderate in 12 patients, and severe in 5 patients. Seventeen patients had cranial MRI in addition to spinal MRI and they did not reveal any abnormality although 2 of them had unilateral 6th cranial nerve paralysis. Conclusion Contrast-enhanced spinal MRI is a reliable imaging for the diagnosis of GBS that it was positive in 30 of 32 of our patients. Clinicians and radiologists should be aware of the characteristic MRI findings which can be used as a supplementary diagnostic modality to clinical and laboratory findings of GBS. P107 Imaging features of late-type vitamin K deficiency bleeding Ali Yikilmaz1, Musa Karakukcu2, Selim Doganay1, Ekrem Unal2, Turkan Patiroglu2, Mehmet Akif Ozdemir2, Abdulhakim Coskun1 1. Department of Radiology, School of Medicine, Erciyes University 2. Department of Pediatric Hematology, School of Medicine, Erciyes University

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Background Vitamin K deficiency, causing bleeding in infant period of life, known as hemorrhagic disease of the newborn (HDN) is divided into three categories: early, classic and late HDN. Early HDN occurs within 24 h, classic HDN occurs on days one to seven; common bleeding sites are gastrointestinal, cutaneous. Late HDN occurs from week 2 to 12; and may be associated with serious and life-threatening intracranial hemorrhage that can be detected with cranial imaging. Objective We discuss the cranial imaging features of late HDN and draw attention to the importance of prophylaxis, early diagnosis and adequate treatment of late-type HDN, and we review the relevant literature. Materials and methods Data of 16 infants treated with late-type HDN in Erciyes University, Gevher Nesibe Hospital between June 2006 and December 2008 have been retrospectively analyzed. The images were interpreted by two radiologists independently and the radiological findings were correlated with neurological findings. Results The patients’s (10 boys and 6 girls) ages varied from 31 days to 10 months (median 3 months). Twelve infants presented with irritability and convulsions, whereas 4 were admitted with complaints of bleeding from previous injections. Ten infants revealed neurological abnormalities including hypertonicity, hyperreflexia, and respiratory disorder. All patients were examined with cranial CT and 4 patients had cranial MRI in the late phase. Twelve of the 16 patients who presented with neurological abnormalities had intracranial hemorrhage and unilateral cerebral edema. The hemorrhages were subpial and subdural in 12, intracerebral in 5, intraventricular in 2 patients. There were subfalcine herniation in 5 patients with hemorrhage and 1 obstructive hydrocephaly secondary to intrecerebral hematoma. Conclusion Clinicians and radiologists have a crucial role in the early diagnosis and adequate treatment of late-type HDN. The awareness of these radiological findings of late HDN will contribute to early diagnosis. P108 Is neuroimaging necessary in children with primary headache? Abdulhakim Coskun, Ali Yikilmaz, Selim Doganay, Ertugrul Mavili, Ibrahim Sacit Tuna, Halil Donmez School of Medicine, Erciyes University, Kayseri, Turkey Background Headache is a common clinical problem during childhood. The role of neuroimaging is controversial. Objective To describe the cranial neuroimaging features in children with primary recurrent headache and evaluate its necessity. Materials and methods Thirty children (19 girls, 11 boys; age range, 6–15 years) with primary recurrent headache were prospectively evaluated with cranial CT (15 patients) or MRI (15 patients). Patients with pathologic neurological symptoms and signs were excluded from the study. Images were evaluated by two radiologists independently with respect to the brain parenchyma. Extracranial structures and sinuses were not evaluated. Results Twenty-four patients showed normal imaging findings. There was ventricular dilatation in 3 patients and mild cerebellar atrophy in

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1 patient. There was a unilateral arachnoid cyst with a diameter of 4 cm in the left temporal fossa in 1 patient. In one patient, there was multiple, bilateral T2-hyperintense foci in cerebral white matter consistent with non specific white matter disease. In this patient, further clinical evaluation was suggested and imaging findings contributed to the patient management. Conclusion The vast majority of the cases had no abnormal neuroimaging findings that changed the patient management. Hence, children who present with primary headache without neurological symptoms and signs should not be warranted routinely in the evaluation of childhood headache. P109 A novel MRI phenotype of severe, generalised polymicrogyria L Hattingh1, E Sheridan1,2, PC Corry1, DT Bonthron2, Y Crow2, CG Woods3, DT Pilz4, N Stoodley5 1. Bradford Teaching Hospitals NHS Foundation Trust 2. Leeds Institute of Molecular Medicine, St James’s University Hospital 3. Department of Clinical Genetics, Addenbrookes Hospital, Cambridge 4. Institute of Medical Genetics, University Hospital of Wales, Cardiff 5. Frenchay Hospital, Bristol Background Polymicrogyria is a malformation of cortical development with abnormal neuronal organisation. It results in multiple small gyri with an irregular grey-white matter junction. Many causes for polymicrogyria are recognised, including congenital infections and genetic syndromes. Objective We present the novel, characteristic MRI phenotype in three patients from two separate families. All patients have severe, generalised bilateral polymicrogyria. The corpus callosum is either absent or hypoplastic. The brainstem has a characteristic pontomedullary junction with a widened upper medulla. The tectum is prominent. The MRI findings are described and illustrated. Conclusion The clinical and MRI phenotype suggests that this is a novel, new genetic syndrome with an autosomal recessive inheritance pattern. Known mutations for polymicrogyria were excluded and therefore it is concluded that this is a recessive mutation in a novel gene.

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Materials and methods We analyzed the MRI findings of five patients (four males, one female; age 3 months to 16 years) with ACC with IHC. Results Our patient population included two Type 1c cysts, in which the cyst was in communication with the ventricle and three Type 2 cysts [type 2b (n=2), type 2c (n=1)], in which the cysts were not in communication with the ventricular system. One of the type 2 cysts had subcortical heterotopia instead of subepandymal heterotopia and the other had no heterotopia; however, all other features were consistent with type 2b ACC with IHC. The patient classified as type 1c showed only unilocular cyst that communicating with lateral and third ventricle without small cerebral hemisphere. Conclusion ACC with IHC is heterogeneous groups of disorders. The recognition of more cases with these anomalies will allow us to restructure different subgroups. P111 High-resolution susceptibility weighted imaging as diagnostic tool for children HJ Mentzel, A Deistung, KH Hermann, M Waginger, HP Burmeister, JR Reichenbach Pediatric Radiology, University of Jena Background Susceptibility-weighted imaging (SWI) is becoming an increasingly used clinical method in neuroimaging MR protocols to study venous related cerebral pathologies and vascular malformations. Objective SWI was evaluated for the diagnostic potential in vascular malformations and in characterizing of cerebral tumors. Materials and methods We studied children with vasular malformations and different cerebral lesions on 1.5T MR units using standard head coils. A high-resolution 3D highly T2*-weighted gradient echo sequence with first-order flow compensation and radiofrequency spoiling was created for SWI. Magnitude and phase images were reconstructed. Results Using high-resolution SWI highly detailed information about the veins was obtained in all patients with vascular malformations. Differentiation of calcified lesions or hemorrhages was possible by using phase images. Conclusion In children high-resolution SWI may be of special importance in the early detection and assessment of vascular malformations and in the differential diagnosis of different tumor entities.

P110 P112 Agenesis of corpus callosum with interhemispheric cyst: MRI findings Murat Kocaoglu, Nail Bulakbasi, Sabahattin Vurucu, Hatice Tuba Sanal, Veysel Akgun, Cem Tayfun Gulhane Military Medical Faculty, Ankara, Turkey Background and objective The origin of the association of the agenesis of the corpus callosum with interhemispheric cyst (ACC with IHC) is controversial and several systems have been proposed to classify this entity. We aimed to present five patients of ACC with IHC, and discuss different aspects from currently established classification system.

Diffusion tensor imaging (DTI) at 3.0 T in dyslexic children and adolescents HJ Mentzel, E Hage, D Güllmar, M Waginger, JR Reichenbach, B Blanz, WA Kaiser, C Ligges Pediatric Radiology, University of Jena, Germany Background Dyslexia is a neurobiological disease of reading and writing abilities. There were some volumetrical reports about structural differences between dyslectic and normal reading children in the area of the planum temporale, the gyrus angularis, and in the frontal lobe.

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Objective Aim of this study was to use Diffusion Tensor Imaging for the evaluation about diffences between dyslexic and normal reading children. Materials and methods 12 dyslexic children (8 boys, 4 girls; age 13.3± 1.04 years) and 11 normal reading children (age and gender matched) were included. Imaging was performed on a 3.0 T MR unit (MR-Tim Trio, Siemens, Erlangen, Germany) using a 12 channel head coil. For DTI a TRSE-EPI-DTI-sequence was used (70 directions, 55 slices, b-values 0–700 s/mm², TR 6,400 ms, TE 80 ms, FoV 240 mm, 2.5 mm voxel isotrop, 08:27 min). The Apparent Diffusion Coefficient (ADC) and fractional anistropy (FA) were evaluated. For group analysis 27 regions of interest in each hemisphere were analysed in each patient. Analysis was performed by using MatLab, SPSS 14.0. Results Signifcant lower value of ADC was observed in dyslexics in the left corona radiata anterior (dyslexics 0.83×10-3 mm²/s, controls 0.87×10-3 mm²/s). There were significant lower FA values in dyslexic children in the right crus posterior of the internal capsule (dyslexics 0.69×10-3 mm²/s, controls 0.72×10-3 mm²/s), but also higher FA values were observed in dyslexics in the corona radiata superior in both hemispheres (right dyslexics 0.56×10-3 mm²/s, controls 0.48×10-3 mm²/s; left: dyslexics 0.59×10-3 mm²/s, controls 0.50×10-3 mm²/s. Conclusion Using DTI structural differences between children with reading disabilities and normal reading cildren could be shown. P113 Polymicrogyria correlation of MRI and clinical findings Ertugrul Mavili, Abdulhakim Coskun, Ali Yikilmaz, Selim Doganay, Halil Donmez Medical Faculty, Erciyes University, Kayseri, Turkey Background Polymicrogyria is a malformation of cortical development characterized by many small gyri separated by shallow sulci. Magnetic resonance imaging (MRI) has greatly facilitated the recognition of polymicrogyria. Although PMG can affect any portion of one or both hemispheres, the sylvian fissures are the most affected lobes. Mental retardation, seizures and motor mental disease are the most presenting clinical features. Objective To evaluate the correlation between clinical presentation and the extent of cortical involvement in patients with polymicrogyria. Materials and methods The MR findings of 26 patients were evaluated for the location and distribution of polymicrogyria. Presence of asphyxia at birth and serological tests for TORCH infections, the presence and type (spastic, flaccid) of motor deficits, mental development, microcephaly, and epilepsy were noted. Results 19 patients had bilateral whereas 7 had unilateral involvement. Patients with unilateral polymicrogyria presented later with milder symptoms. The most encountered symptom in patients with bilateral involvement was MMR (89%) and speech problems (84%). The clinical presentations of patients with asphyxia and positive serological tests for CMV were worse. All patients with positive serological tests for CMV had bilateral involvement. Perisylvian region was affected in 5 (71%) patients with unilateral involvement. The most encountered presenting symptom in these patients was epilepsy. Cerebral palsy was seen in three (43%) of the patients and

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all of them had left hemiparesis. Microcephaly, MMR and speech delay was detected in one (14%) of the patients. Conclusion Late presenting epilepsy may be a predictor of a unilateral polymicrogyria and is associated with relatively good prognosis. CMV infection and the presence of asphyxia are predictors of worse prognosis.

P114 Magnetic resonance imaging findings in infantile meningoencephalitis J Bracken, S Walsh, S Ryan, VB Donoghue, ET Womey Children’s Universtiy Hospital, Temple Street, Dublin Background Meningoencephalitis can result in a number of serious complications affecting the developing infant brain. Identification of these complications plays an important role both in guiding patient management and assessing prognosis. Magnetic resonance imaging (MRI) of the brain is central to the radiological assessment of such patients. Objective To describe the range of magnetic resonance imaging features found in infantile meningoencephalitis due to a variety of microorganisms. Materials and methods A retrospective review was performed of the imaging findings in all infants with proven microbial meningitis/ meningoencephalitis who underwent MR Brain examination over a three-year period between January 2006 and January 2009. Results A total of 29 infants were identified during the study period, the majority (17) of whom were male. The age at presentation ranged from 11 days to 15 months with a median age of 15 weeks. Fourteen of the patients were neonates at presentation. A variety of organisms were identified as follows: gram positive bacteria (17 cases): S. pneumoniae, Group B Streptococci, Group D Streptococci; gram negative bacteria (8 cases): N. meningitidis, E. coli, Enterobacter, H. influenzae type B, Proteus; viral organisms (3 cases): Herpes simplex, Cytomegalovirus, Human Herpes Virus type 6 and one case of the protozoan Toxoplasmosis. All patients, with the exception of one, had acute abnormalities on initial MRI. Complications found on imaging included: oedema (12); infarction (11); ventricular dilatation (8); ventriculitis (6); infected porencephalic cysts (1); extra-axial fluid collections including subdural effusion (3), small subdural haematoma (2), extra-axial pus collection (4); pachygyria (1-Toxoplasmosis); periventricular calcification (1Toxoplasmosis); polymicrogyria (1-Cytomegalovirus). Conclusion We found a wide variety of imaging abnormalities in infants with meningitis/meningoencephalitis ranging from more common findings such as infarction to rarer complications such as ventriculitis and subdural haematoma. P115 Pre-natal diagnosis and post-natal follow up of rapidly involuting congenital hemangioma (RICH) Michael F Fadell, Blaise V Jones, Denise Adams Cincinnati Children’s Hospital, USA Background Congenital hemangiomas are recently classified neoplasms that are distinct from the more common capillary hemangiomas of infancy

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in that they are mature at birth. These uncommon lesions can be further divided into two distinct subcategories; rapidly involuting (RICH) or noninvoluting (NICH). Rapidly involuting congenital congenital hemangiomas (RICH) are more common, with the majority involuting completely by 12 months of age. Noninvoluting congenital hemangiomas (NICH) never involute, demonstrate proportional growth, and require eventual treatment with excision. Objective To demonstrate the clinical and imaging findings of an intracranial rapidly involuting congenital hemangioma (RICH). Materials and methods Pre and post-natal MRI, along with ultrasound, and computed tomography (CT) was used to identify and follow the anatomy, imaging characteristics, vascularity, and size of this intracranial lesion. Results We present the case of an intracranial, extra-axial, vascular lesion with an associated cutaneous component. Following intralesional hemorrhage, it demonstrated rapid involution within the first year of life. Conclusion This poster will present the salient imaging findings and clinical features of an intracranial rapidly involuting congenital hemangioma (RICH). We have found no prior reports of an intracranial rapidly involuting congenital hemangioma (RICH) in our review of the literature. P116 An MRI approach to the CNS inflammatory demyelinating disorders in children Monica Rebollo Polo, Eoghan E Laffan, Daniela Pohl, Hussein Nasser, Hazar Tabban, Julie Hurteau-Miller Children’s Hospital of Eastern Ontario, Ottawa, Canada Background CNS inflammatory demyelinating disorders of childhood include both self-limited and life-long conditions that can be difficult to differentiate clinically at the time of presentation.The identification and ddx of pediatric Multiple Sclerosis (MS) and other related demyelinating syndromes, such as ADEM (Acute Demyelinating Encephalomyelitis) or NMO (Neuromyelitis Optica), is a hot topic in the current Pediatric Neurology literature. Discussions focus on the importance of early differentiation of these disorders.MRI plays a major role in the diagnostic approach and monitoring of demyelinating disease. New MRI diagnostic criteria for pediatric MS have been recently proposed in the Pediatric Neurology literature. Objective To review the MRI findings of the CNS demyelinating disorders of the childhood, placing emphasis in their ddx. Materials and methods We describe the MRI findings of 13 the patients with demyelinating diseases seen at our Institution. We focus on the ddx between MS, ADEM and NMO in the context of the new international consensus definitions. We also place emphasis in the MS cases, according to the new MRI criteria proposed for pediatric MS. Results We review the MRI findings that are more typical of each entity (MS, ADEM,NMO). Periventricular lesions are more frequent in children with MS. A diffuse bilateral lesion pattern is more typical of ADEM. MS initial presentation can meet the diagnostic criteria of ADEM. Two patients initially diagnosed as ADEM were reclassified as MS. NMO affects the optic nerves and spinal cord. One patient with NMO also showed brain lesions, located in the hypothalamus and brainstem.

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Conclusion MRI plays a major role in the diagnostic approach of demyelinating disorders. New MRI diagnostic criteria for pediatric MS have been recently proposed. The Pediatric Neuroradiologist should be aware of the new international consensus definitions proposed for pediatric MS and related disorders.

P117 Typical CT findings of alobar holoprosencephaly Sacide Unel, Esra Coskuntuncel, Unal Egeli, Saban Odabasi Vakif Gureba Educational Hospital, Istanbul, Turkey Background Holoprosencephaly is the most common forebrain defect in humans with a prevelance of 1:10.000 and 1:20.000 at birth. The holoprosencephalies are a group of disorders that are characterized by a failure of differantiation and cleavage of prosencephalon, and divided into three categories: alobar, semilobar and lobar. Alobar holoprosencephaly is the most severe form. Objective Altough alobar holoprosencephaly is the most common form of holoprosencephaly diagnosed by prenatal ultrasound, affected patients are rarely imaged by CT or MR postnatally. Thıs rarity probably stems from the fact that most affected infants are stillborn or have a very short lifespan . In this poster we report cranial BT images of an eight months aged baby who had typical findings of alobar holoprosencphaly. Materials and methods An eigth moths aged female baby with severe facial abnormalities (hypotelorizm, median lip and palate cleft, single nostril) and hypotonia admitted to our hospıtal because of epilepsy. After clinical examination a nonenhaced CT of the brain was performed. Results On the nonenhaced CT of the bran we observed a large thin layer of cortex around a large monoventricle with large dorsal cyst. No interhemispheric fissure, falx cerebri, third ventricle or corpus callosum could be identified. The thalami and basal ganglia were reduced in volume, fused and anteriorly placed. Conclusion Alobar holoprosencephaly is the most severe form, imaging studies are severely abnormal, as well. In affected patients, ventral medial portions of the brain never form. As a result the hypotalami and basal ganglia are fused and reduced in volume and the third ventricle is absent. Patient with alobar holoprosencephaly usually have severe midline facial deformities and hypotelorism, resulting from absence or hypoplasia of the premaxillary segment of the face . Imaging of the brain by CT or MRI confirms the diagnosis of holoprosencephaly, defines the subtype, and identifies associated CNS anomalies. P118 Traumatic herniation of buccal fat pad into the oral cavity with fat necrosis Bhairav Patel, Brandon Tran, Jill Hunter, Ellen Friedman Texas Children’s Hospital, USA Background There is an extensive differential diagnosis for pediatric intraoral masses, though the demonstration of fat within a mass significantly limits the possibilities. A rare fat-containing mass within the pediatric oral cavity is discussed.

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Objective To describe the pertinent CT imaging findings of a rare complication of pediatric oral trauma, herniation of buccal fat pad into the oral cavity. Case report 10 month old male who fell onto the right side of his face. The following day the patient had difficulty feeding and was found to have a soft, pedunculated intraoral mass arising from the right buccal mucosa. A contrasted CT of the neck was performed. On the basis of the CT findings the patient was taken to the operating room where a small defect within the buccal mucosa just posterior to the orifice of the parotid duct was found, from which the aforementioned mass protruded. Results CT of the neck demonstrated a well-circumscribed 1.5 cm focus of fat attenuation with superimposed inflammatory changes, which was in direct contiguity with the ipsilateral buccal fat pad. No associated calcifications, maxillary osseous changes, or lymphadenopathy were present. Histological analysis of the resected intraoral mass demonstrated benign adipose tissue with superimposed fat necrosis. Conclusion The differential diagnosis for soft tissue masses within the pediatric oral cavity is rather extensive and includes granular cell tumors including congenital epulitides, rhabdomyomas, salivary gland tumors, venolymphatic malformations, ectopic thyroid tissue, traumatic granulomas, and fat-containing masses. Pediatric fat-containing intraoral masses would include dermoid cysts, tumors of adipose origin, or surgically placed fat for the correction of various oral cavity defects. In addition, though a relatively rare entity with less than forty case reports in the literature in the presence of antecedent trauma and fat-containing mass identified on imaging traumatically herniated buccal fat pad into the oral cavity should be considered. P119 Value of brain 1H-MR spectroscopy in pediatric patients with normal brain MRI Girish Kori, Hashim Hayder, Nicole Hauser, Andrea Gropman, Nadja Kadom, Gilbert Vezina George Washington University Medical Center Background The utility of proton-MR spectroscopy (MRS) of the pediatric brain is well established for a variety of conditions (i.e. Canavan’s, hyperglycinemia, leukodystrophy). However, there is little data on the overall utility of pediatric brain MRS in the setting of normal conventional MRI imaging. Objective Better defining clinical and imaging scenarios in which MRS will likely be diagnostic or supportive in diagnosis/therapy may help utilize this resource more effectively. We hypothesize that the diagnostic yield of MRS is lower in patients with otherwise normal conventional MRI (cMRI)findings, than in those with additional abnormalities on cMRI sequences. Materials and methods Retrospective analysis was performed of MRS studies completed October 1, 2007–September 30, 2008. The imaging results were documented separately for cMRI and MRS into 3 categories: “normal”, “abnormal without contribution to diagnosis”, and “abnormal with contribution to diagnosis”. The coincidence of diagnostic outcomes between conventional MR and MRS was

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determined. Pictorial essay of typical cMRI/MRS findings is also presented. Results The total number of MRS studies performed over the 12 month period was 153. Overall, 50 MRI studies had a normal MRS in conjunction with a normal cMRI. In 41 studies, there was a normal MRS in conjunction with an abnormal cMRI. In 62 patients, both MRS and cMRI were abnormal; of these studies, MRS significantly contributed to making the diagnosis in 44 patients and was non-contributory in 18 cases. No studies were found in which the MRS was abnormal in conjunction with a normal cMRI. Conclusion Our data demonstrates that MR spectroscopy is normal in the presence of a normal conventional MRI. Also, MRS was significantly contributing to the diagnosis in 33% (44/154) of patients. Imaging resources may be more economically utilized if MR spectroscopy is directed to patients with abnormal cMRI or high clinical suspicion for a leukodystrophy. P120 Retroperitoneal liposarcoma with ureteropelvic junction stricture: A case report Mo-Kiu Lau1, Wu-Chung Shen1, Chao-Jan Wang2, Chuen Shueh3 1. Department of Radiology, China Medical University Hospital, Taipei & Taichung 2. Department of Medical Imaging and Intervention, Chang Gung Children’s Hospital at Linkou, Taiwan 3. Department of Pathology, Chang Gung Children’s Hospital, Linkou, Taiwan Background Retroperitoneal liposarcoma in children is very rare. About less than 10 cases were reported previously. History A 5y/o boy with chief complaint of intermittent pain over right thigh, calf and abdomen in recent 2 weeks following by urine frequency and voiding pain for several days came to our OPD for medical attention. Images Renal ultrasound revealed bilateral hydronephrosis more severe on right side and a 63×60×68 mm heterogenous mass compressing urinary bladder. CT showed a soft tissue lesion with hypodense content over presacral region, pushing the urinary bladder left anteriorly with peripheral and heterogeneous enhancement; bilateral hydronephrosis with mass compression to right distal ureter was identified. Delayed scan depicted more internal homogenous enhancement without fatty component. Differential diagnosis included Rhabdomyosarcoma, lymphoma, neuroblastoma and liposarcoma. Bone scan and bone marrow showed no metastasis and normal blood cells respectively. Surgical en bloc excision discovered a hard yellowish tumor without invasion to adjacent organs and pathology revealed myxoid and round cell liposarcoma. Right pyeloplasty was also done. Conclusion Although liposarcoma is very rare in children, it should be included in the differential diagnosis; solid pattern in CT is one of the three presentations; association with ureteropelvic junction stricture has not been reported before, it may be a new disease entity or coincidence. Radical excision of tumor usually comes up with complete cure but recurrence may occur.

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Materials and methods A total of 90 patients who performed WBMRI were enrolled. The images were reviewed and a consensus was reached by two radiologists for the diagnosis. Among these, unsuspected abnormalities were found in 12 patients (6 males, 6 females; mean age, 9 years, age range 5 months–16 years). We retrospectively analyzed the clinical characteristics and WB MRI findings of twelve patients. Diagnoses of the lesions were confirmed by histological examination, medical examination and history of interview, regression of the lesions on follow-up examinations. For comparison three malignant lesions confirmed to be subcutaneous panniculitis T cell like lymphoma were included. Results Disseminated fungal soft tissue abscesses in the muscle and subcutaneous soft tissue were found in one girl with a history of acute lymphocytic leukemia. One patient had focal abscess adjacent to central venous catheter. Other major diagnoses were variable pattern of soft tissue edema (n=5), insect bites (n=3), scratch wound (n=1), and cellulites with an abscess (n=1). Conclusion Unsuspected soft tissue lesions of a variety causes encountered using WB-MRI may confused and mimics malignant involvement in pediatric onologic patients. Therefore, awareness of this possibility, correlation with clinical history and other imaging findings might help to make the differential diagnosis and avoid unnecessary treatment.

CT findings in peritoneal involvement of Wilm’s tumor: A case report H Gokce Cinar, Secil Eksioglu, Yasemin Tasci Yildiz, Cigdem Uner, Nazmiye Yuksek Department of Radiology and Oncology, Dr. Sami Ulus Women and Children Diseases Hospital, Ankara Background Intraperitoneal neoplasms are rare in children compared to adults. Peritoneal involvement can be primary or metastatic from ekstraperitoneal neoplasms. Ovarian germ cell tumor, lymphoma, neuroblastoma, intracranial tumors and finally Wilm’s tumor all have been reported to metastase to the peritoneum. Objective To evaluate the different CT appearences of peritoneal involvement in a case with Wilm’s tumor. Materials and methods The patient presented with abdominal distansion nine months after second surgery performed for recurrence left-sided Wilm’s tumor. After administration of oral and IV contrast agents contiguous axial abdominal CT images were obtained with a Hitachi Radix Turbo Spiral CT using a 10 mm thickness, 10 mm table incrementation and pitch 1. Results CT revealed plaque-like thickening in the parietal peritoneum along the undersurface of the right hemidiaphragm, broad based solid masses located on the visseral surface of the left lobe of liver and the location of spleen ; noduler lesions located in the mesentery of the small bowel; tumor invasion of the falciform ligament and gallbladder bed and massive ascites. Conclusion The CT apperarance of neoplastic involvement of the peritoneum has been described as plaque-like thickening or nodular solid implants in the parietal peritoneum, generally that lining the diaphragm and/or visseral peritoneum, usually in the perihepatic space. The lesions that are detected in pelvis especially in Douglas are named as drop metastasis. The diffuse infiltration of the greater omentum reveals the characteristic omental cake appearence. Ascites often accompanies. Our case had both the plaque-like peritoneal thickening and the noduler mass lesions together with massive ascites. Peritoneal metastasis in Wilm’s tumor are generally encountered after surgery as in our case. Before deciding for a treatment it is very important to show local or distant involvement in Wilm’s tumor and CT is the single preferred examination. P122 Unsuspected soft tissue lesions identified on pediatric oncologic patients using whole-body MRI Gye-Yeon Lim, Soo Ah Im, Nak Gyun Chung The Catholic University of Korea Background Whole-body MRI (WB-MRI) has advantages over other imaging modalities for evaluating the possible extent of involvement in pediatric oncologic patients and it has excellent characterization of soft-tissue lesions. Objective The purpose of this study was to describe unsuspected soft tissue lesions identified at staging and follow up of pediatric oncologic patients using whole body MRI.

P123 The impact of the new international staging of paediatric neuroblastoma on multi-modality imaging N Tahir, WH Ramsden, AF Scarsbrook Leeds Teaching Hospitals NHS Trust, UK Background The staging classification system for neuroblastoma is due to be updated in the very near future in order to address the older systems’ problems such as the inability to compare patients from different countries and the issue of post-surgical staging. Objective To describe the New International Staging System of Neuroblastoma. To illustrate the range of available imaging techniques and review the spectrum of radiologic and radionuclide appearances in neuroblastoma. To discuss the role of different imaging modalities in the initial diagnosis and disease monitoring process. Content The New International Staging System of Neuroblastoma and the implications for imaging evaluation will be described. Multi-modality imaging techniques including ultrasound, contrast enhanced MR, multi-detector CT, skeletal and radio-labelled metaiodobenzylguanidine (MIBG) scintigraphy and positron emission tomography will be used to illustrate the spectrum of disease. Imaging algorithms for the initial diagnosis/staging and monitoring/detection of suspected disease recurrence will also be presented. Conclusion This exhibit will discuss the new international staging of paediatric neuroblastoma with particular emphasis on the impact of imaging evaluation. A pictorial review of the radiological features of neuroblastoma on cross-sectional and functional imaging will also be presented.

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P124 Spinal cord compression by metastatic non-CNS malignancy in children R Singaroyan, T Win, A Raghavan Sheffield Children’s Hospital, UK Background Spinal cord compression is a rare but serious complication of malignant disease in children. Acute spinal cord dysfunction in children with systemic malignancy is a neurosurgical emergency and is usually due to metastatic spinal cord compression. Neuroblastomas are considered the commonest cause of metastatic spinal disease and sarcomas are considered the commonest cause of spinal cord or nerve root compression in children. Spinal cord compression is a rare presentation of nonHodgkin’s lymphoma, occurring in 0.1% to 3.3% of patients. Osteosarcoma, Ewing’s sarcoma and rhabdoid tumours are other rare causes of cord compression in children. Objective To present the imaging features of some of the rare causes of metastatic non-CNS spinal cord compression. Materials and methods Nine cases of spinal cord compression due to non-CNS malignancy were identified in our institution over the last 10 years. The causes included four cases of non- Hodgkin’s lymphoma, two cases of osteosarcoma, one case of Ewing’s sarcoma, one neuroblastoma and one rhabdoid tumour. The imaging consisted of CT, MRI and CT myelogram. Results Though CT picked up the lesions initially MR was confirmatory and showed the extent of disease more clearly. MR was also used in follow up. CT myelogram was useful in cases of prior spinal fixation where the metal work degraded the image quality of CT and MRI. Conclusion Though non-CNS spinal metastasis causing cord compression is rare in the pediatric population knowledge of imaging features is vital to diagnosis and treatment. We present the imaging features of the cases we have encountered in our institution.

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On physical examination, jaundice on the skin and sclera with paraplegia on lower extremities were observed. Laboratory examinations revealed anemia, increased hepatic enzymes, hyperbilirubinemia, and hypocalcemia. On abdominal CT, a 22×17 cm huge mass containing necrotic and calcified areas was seen thoracic vertebra 7 and sacral vertebra 1 involving both the vertebrae and paravertebral soft-tissue with heterogeneous contrast enhancement. Also a 8× 7,5 cm metastatic mass with irregular contour was detected on pancreatic head and peripancreatic region having the same tomographic findings with the vertebral mass. The intra- and extrahepatic bile ducts were dilated owing to the compression of common bile duct by the metastatic mass. Tru-cut biopsy of the pancreatic mass confirmed the diagnosis of osteosarcoma. Conclusion Although extremely rare, osteosarcoma metastasis should be included in the differential diagnosis of pancreatic mass lesions especially in those containing calcifications and necrotic areas. P126 A case of succesfull treatment of infantile myofibromatosis with pulmonary affection, by watchful waiting LS Ording Müller, DFM Avenarius, Tore Stokland University Hospital North Norway Case report After a normal pregnancy a boy was born with extensive cutaneous and pulmonary lesions of infantile myofibromathosis. He was given no treatment and was closely followed clinically and radiologically for two years. According to litterature viseral involvment of this disease has a bad prognosis. Intensive treatment with chemotherapy has been given in similar cases. Results Two years follow up of our patient has shown spontanious regression of all lesions, both pulmonary and subcutaneous. The patient has developed normally and shows no signs of disease. Conclusion Infantile myofibromatosis with viceral involvement is a rare disease where there is no consensus in the litterature of the best treatment. This case shows that, despite viceral involment, patients with this diagnosis do not necessarily need treatement.

P125 P127 Vertebral osteosarcoma pancreas metastasis Serhat Avcu, Huseyin Akdeniz, Harun Arslan, Nursen Toprak, Ozkan Unal Department of Radiology, Yuzuncu Yil University, Van, Turkey Background Osteosarcoma is the most common malignant bone tumor in children and adolescents, and posseses a high potential of metastasis. The most common sites of metastasis of osteosarcoma are lung, pleura, and bone, the pancreas being extremely rare. Osteosarcoma predominantly involves the metaphysis of tubular bones, and primary vertebral osteosarcoma is a rare entity. Objective We aimed to report a case of primary vertebral osteosarcoma metastatic to pancreas with computerized tomography (CT) findings. Materials and methods The patient was evaluated with abdominal CT. Tru-cut biopsy was performed to the pancreatic mass. Results A 14-years-old boy being followed-up with a diagnosis of primary vertebral osteosarcoma for 6 years applied to our hospital with complaints of nausea, vomitting, diarrhea, melena, and jaundice.

Radiological assessment of complications after endoprostheses implantation in children with musculoskeletal malignancies Jarosław Mądzik1, Beata Iwanowska3, Hanna Brągoszewska3, Izabela Kopyś-Wiszniewska1, Magdalena Rychłowska-Pruszyńska2, Maria Uliasz1, Wojciech Woźniak2 1. Department of Diagnostic Imaging, Warsaw, Poland 2. Department of Pediatric Oncologic Surgery, Warsaw, Poland 3. Institute of Mother and Child, Warsaw, Poland Objective To illustrate the complications after grafting the limb endoprostheses in children with malignant tumors of the musculoskeletal system. To analyze the usefulness of diagnostic imaging methods in the diagnosis of these complications. Materials and methods Material consists of 63 patients after grafting the limb endoprosthesesin the period 2005–2007 (32 boys, 30 girls), aged 8–30 years, mean age 14.5 years. In all patients plain radiographs and sonography of the limb with endoprosthesis were

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performed. On plain films fixation of the endoprosthesis in bone and the structure of stump were assessed. On ultrasound the healing process of soft tissues and of bone were evaluated. In chosen cases CT and/or MRI were added to the diagnostics. Results Complications were observed in 19 patients (30%). The most frequent complications diagnosed or confirmed radiologically were: osteoporosis of bones distally from endoprosthesis (96% of patients), inflammation of the soft tissues (21%), bone inflammation (5%), shortening of the endoprosthesis after its lengthening (20%), fracture of stump of bone (45%), loosening of the endoprosthesis (16%), local recurrence of the tumor (9%) and fracture of the endoprosthesis (4%) Conclusion Plain radiographs in two projections and sonography are basic imaging methods used in children after grafting the endoprostheses of limbs. Other methods (CT, MRI) have limited use due to the artifacts caused by the metal elements of endoprostheses. Differentiation between complicated healing and local recurrence of the tumor is often difficult and may require pathological confirmation. P128 Imaging of the pediatric patient with acute myeloid leukemia (AML): Findings at presentation and during treatment Jeffrey Traubici, Dimitri Parra, Lillian Sung Hospital for Sick Children/University of Toronto, Canada Background Acute leukemia is the most frequent type of cancer in childhood. Approximately 15% to 20% of childhood leukemias are of the AML type, with an incidence of 5 to 7 cases per million people per year in the United States. Despite advances, AML accounts for 30% of the deaths secondary to leukemia in children.The term AML refers to a varied group of malignancies arising in the marrow. The etiology and pathogenesis of the disease is complex, involving different genetic mutations resulting in proliferation and increase in the survival of myeloid cells. Other important factors are the exposure to environmental factors (e.g. chemotherapy, ionizing radiation etc) and having certain inherited and acquired conditions (e.g. Down syndrome, Fanconi anemia etc). Treatment of AML can result in significant morbidity. Objective The purpose of this presentation is to illustrate the imaging findings in AML at presentation as well as to demonstrate the various complications of treatment. Materials and methods After obtaining institutional ethics board approval, a database of AML patients was accessed and pertinent imaging studies assessed. Results In the last 9 years (January 2000–December 2008), 90 new cases of AML had been diagnosed at our institution. Using various modalities (radiographs, ultrasound, computed tomography and magnetic resonance imaging), we have observed abnormalities at presentation including parenchymal lung disease, infiltration of solid viscera, osteomyelitis, soft tissue infections and bone marrow abnormalities. During treatment we had seen multiples complication including fungal infections of different organs, neutropenic enterocolitis, typhlitis, abscesses, deep venous thrombosis and hepatic veno-occlusive disease. Conclusion There is a wide spectrum of imaging findings seen in seen in pediatric patients with AML. Some are seen at presentation and others are the sequelae of intense treatment. Familiarity with the appearances will aid the pediatric radiologist in the imaging of patients with AML.

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P129 Focal nodular hyperplasia of the liver after treatment of neuroblastoma Berna Oguz, Ilkay Idilman, Musturay Karcaaltincaba, Mithat Haliloglu Department of Radiology, Hacettepe University, Ankara, Turkey Background Focal nodular hyperplasia (FNH) is a benign hepatic tumor that is uncommon in children. An increased incidence of FNH has been described in oncology patients after completion of tumor therapy. Its development may be related to the vascular damage induced by such therapy. Objective We present MRI findings of a child who developed FNH after receiving chemotherapy for primary disease of neuroblastoma. Materials and methods A boy with right surrenal mass had been diagnosed with neuroblastoma at 2 years of age. He had been underwent surgery and received antineoplastic therapy. He was in remission for 8 years. When the patient was 10 years of age, thorax CT for the evaluation of fever and productive cough revealed solid masses in the upper part of the liver. Magnetic resonance imaging was performed to evaluate the liver lesions and to rule out metastasis. Results The lesions were isointense to slightly hyperintense on T2weighted images, isointense to slightly hypointense to liver on T1weighted images. A small central scar of the largest diameter lesion was hyperintense on T2-weighted images. After contrast administration, the lesions highly enhanced homogenously during the arterial phase and became isointense during the portal venous phase. The central scar of the largest lesion demonstrated delayed enhancement. Malignant lesions, in contrast, are almost always hyperintense on T2-weighted images, typically hypointense on unenhanced T1-weighted images and delayed images and hyperintense during the arterial phase and have a variable appearance during the portal venous phase. FNH of the liver was diagnosed because of the typical appearance of the lesions on MRI. Conclusion FNH should be considered in a patient with a history of malignancy treated with chemotherapy who develops hepatic masses. Recognition of the characteristic imaging appearance will aid in the correct diagnosis and might obviate the need for biopsy. P130 Fast and accurate magnetic resonance imaging protocol to document central nervous system and sinus abnormalities prior to pediatric hematopoietic stem Henrique M Lederman, Eliane L Donato, Felipe G Barbosa, Cinthya R Carvalho, Gilberto Szarf, RV Gouveia, Victor G Zecchin, Valeria C Ginani Federal University of Sao Paulo, Sao Paulo, Brazil Background Patients undergoing bone marrow transplant (BMT) may have several risk factors for infectious complications. Active asymptomatic sinus infection at the time of admission carries a high risk and must be treated prior to initiation of the conditioning regimen. Central nervous system (CNS) complications are also common after BMT and may be related to the chemotherapy and/or radiation given to treat the underlying malignancy or may be specifically due to transplant-related complications. The only effective way to sort it out is having an underlying evaluation prior to the

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admission for transplant. The current standard method used to evaluate the patients pre-BMT is head and sinus computerized tomography (CT). However, this method is not accurate to demonstrate subtle CNS abnormalities and white matter diseases. Moreover, CT exposes the patient to radiation, which varies from 0.02 to 0.1 Gy. Head magnetic resonance imaging (MRI), despite much better sensitivity for white matter abnormalities, cannot be routinely used due to the higher cost and longer duration of the exam. Objective Our objective was to design a fast, inexpensive and radiation-free MRI-based protocol to document any sinus or brain abnormalities that could mandate intervention or change the preparative high-dose chemotherapy regimen. Materials and methods Analysis of the feasibility of the head and sinuses MRI protocol: axial T1, axial Flair and coronal T2. Results The duration of the examination in this protocol was six minutes. The brain MRI images were highly sensitive for CNS abnormalities and the coronal T2 was excellent to diagnose sinus disease Conclusion Our MRI protocol is sufficient for the evaluation of patients referred for BMT with reduced examination time and no radiation to the patient. P131 Technical approach to T1 mapping in childhood abdominal tumours Teresa Totman, Oystein Olsen Great Ormond Street Hospital NHS Trust, UK Background T1 measurements are important for quantification of tissue perfusion, which is of interest in childhood tumours. However, technical restraints may hinder reliable T1 mapping. Objective To develop and compare the performance of two different techniques for T1 mapping in the abdomen Materials and methods We developed MRI spoiled gradient echo sequences for T1 mapping using 1) variable time of inversion with prospective respiratory gating, and 2) variable flip angle with a single breath-hold acquisition. The technical feasibility was assessed for five patients in each group. We then went on to compare T1 values using both techniques in five subsequent patients. Results Both techniques were feasible, and detailed results will be presented.

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Conclusion T1 mapping is feasible and valid even in abdominal MRI in infants and young children.

P132 The incremental value of 18F-FDG PET-CT compared to contrast enhanced CT in the evaluation of paediatric Hodgkin’s disease N Tahir, F Chowdhury, AF Scarsbrook Leeds Teaching Hospitals NHS Trust, UK

Background PET-CT combines functional and morphologic data and has been shown to increase diagnostic accuracy in Hodgkin’s disease. Objective To review our initial experience of the additional information provided by 18F-FDG PET-CT above conventional CT in adolescent patients with Hodgkin’s disease. Materials and methods Consecutive paediatric patients with Hodgkin’s disease who underwent PET-CT imaging as part of disease assessment were identified retrospectively from an institutional database. The findings were compared with the corresponding diagnostic quality CT performed within 2 weeks of the PET-CT. Results During the study period from May 2007 to January 2009, 33 PET-CT scans were performed in 15 patients. Three scans were omitted from the study because no corresponding CT scan was available for comparison. The age range of the patients was 9 years to 19 years. Tweenty-three (77%) scans were performed to assess response to treatment and 7 (23%) scans for baseline staging. PETCT provided additional information in 24 (80%) scans: in 10 (33%) scans PET-CT more accurately characterised the presence of disease or detected additional sites of disease and in 11 (37%) scans PET-CT confirmed remission in patients with residual structural abnormality. PET-CT identified additional sites of extra-nodal disease in 3 (10%) cases: 1 bone involvement, 1 splenic involvement, 1 chest wall involvement. There was one false positive PET-CT finding where suspected marrow involvement was negative on bone marrow biopsy. Conclusion PET-CT provided significant additional information in 80% of scans compared to conventional imaging and correctly identified additional extra-nodal disease in 10%. This was instrumental in guiding subsequent patient management.