A rare malignant hepatic tumor of childhood: transitional liver cell tumor revisited.

Transitional liver cell tumor is an extremely rare entity and has a poor prognosis. It has similar histopathologic findings with hepatoblastoma and hepatocellular carcinoma. Up to now, only 10 cases have been reported in the literature. We report on an 8-year-old boy with histologically proven transitional liver cell tumor and describe the pertinent radiological findings.

Radiological manifestations of abdominopelvic nerve tumours seen in neurofibromatosis type 1.

Neurofibromatosis type 1 (NF1) is the most common of the phakomatoses, which is inherited in an autosomal dominant pattern. Neurofibromas arise from Schwann cells and fibroblasts and plexiform neurofibromas are pathognomonic for NF1, which may arise in any peripheral nerve. The clinical expression of NF1 is extremely variable and gastrointestinal manifestations of NF1 are relatively uncommon. The purpose of this article is to illustrate the abdominal ultrasound, computed tomography, and magnetic resonance imaging findings of abdominopelvic nerve tumours seen in NF1 in both paediatric and adult patients.

Acute intestinal anisakiasis: CT findings.

Small bowel anisakiasis is a relatively uncommon disease that results from consumption of raw or insufficiently pickled, salted, smoked, or cooked wild marine fish infected with Anisakis larvae. We report a case of intestinal anisakiasis in a 63-year-old woman presenting with acute onset of abdominal complaints one day after ingestion of raw wild-caught herring from the Northsea. Computed tomography (CT) scanning demonstrated thickening of the distal small bowel wall, mucosa with hyperenhancement, mural stratification, fluid accumulation within dilated small-bowel loops and hyperemia of mesenteric vessels. In patients with a recent history of eating raw marine fish presenting with acute onset of abdominal complaints and CT features of acute small bowel inflammation the possibility of anisakiasis should be considered in the differential diagnosis of acute abdominal syndromes.

Radiological findings in a rare case of eyelid swelling: Pott's puffy tumor.

Pott's puffy tumor (PPT), or osteomyelitis of the frontal bone, is a rare entity especially in adults. PPT is believed to occur as a complication of fronto-ethmoidal sinusitis or trauma to the frontal bone. We present the computed tomography and magnetic resonance imaging findings in such a rare case of Pott's puffy tumor.

CT and MR findings in a neuroforaminal extraskeletal Ewing sarcoma mimicking benign nerve sheath tumor.

INTRODUCTION: We report the CT and MR findings in a 30-year-old man with extraskeletal Ewing sarcoma (EES) involving the left neural foramen at L5-S1 level. MATERIALS AND METHODS: The patient was evaluated with preoperative lumbosacral CT and MR imaging and postoperative lumbosacral MR imaging. RESULTS: The lesion was hyperdense on CT, isointense on T1- and T2-weighted MR images, and enhanced homogeneously after intravenous gadolinium injection. With these CT and MR findings, surgery was performed with a presumptive diagnosis of nerve sheath tumor, but the histopathological examination revealed EES. Chemotherapy and radiotherapy were planned postoperatively. CONCLUSION: This case illustrates that even in benign looking lesions in a neuroforamen one can never exclude malignancy, and this is even more true in a population of young adults.

MRI findings in giant pontine capillary telangiectasis associated with a developmental venous anomaly.

We report a 32-year-old woman with an exceptionally large capillary telangiectasia in the brainstem which is associated with a developmental venous anomaly (DVA). Her major problems were nystagmus in both eyes, binocular diplopia, gait abnormalities, cerebellar ataxia, slightly disturbed finger-nose test, an instable Romberg test and obvious dysartria. The diagnosis was made on the basis of specific imaging findings, and the use of gradient echo-weighted images proved to be helpful in making a differential diagnostic decision.

Persistent primitive hypoglossal artery and fenestration of posterior cerebral artery: CT and MR angiography.

Persistent primitive hypoglossal artery (PPHA) which is a persistent carotid-basilar anastomosis is a rare vascular anomaly. It is usually found incidentally. Fenestrations of cerebral arteries are uncommon. Herein we present a case of PPHA with fenestration of posterior cerebral artery. A 28 year old man was admitted to our hospital with complaints of dizziness and temporary loss of vision. Neurological examination revealed no abnormal findings. The patient was further evaluated with CT and MR angiography. To our knowledge, the case we reported is the first case in the literature with PPHA and fenestration of posterior cerebral artery. The detection of PPHA and associated vascular anomalies and diseases are important before surgical and interventional procedures. CT and MR angiography are much safer diagnostic alternatives in the detection of PPHA and fenestrations. When PPHA is detected, attention should be given to the coexistent posterior circulation anomalies.