Atypical Radiological Presentation of a Wingless-Type Pediatric Medulloblastoma.

minimal enhancement and showed no restriction on diffusion-weighted imaging ( fig. 2 ). With a provisional diagnosis of pilocytic astrocytoma in view of location and age, the child underwent a retrosigmoid craniotomy. Intraoperatively, the cyst-containing hemorrhagic fluid was drained. The solid component was firm and vascular with a poor plane at the pial surface near the VII-VIII nerve complex. There was no intraventricular component, and a gross total excision was performed. Postoperatively, the child recovered without any new deficits. A 13-year-old girl was seen in our department for raised intracranial pressure symptoms progressing over 1 month. Neurological examination revealed a right hemispheric cerebellar syndrome and papilledema. Magnetic resonance imaging (MRI) revealed a predominantly cystic lesion located in the right cerebellar hemisphere extending towards the middle cerebellar peduncle with a mass effect on the fourth ventricle and brainstem. T1and T2-weighted sequences demonstrated a fluid level within the cyst suggestive of hemorrhage ( fig. 1 ). The solid component presented Received: March 18, 2016 Accepted after revision: June 2, 2016 Published online: August 5, 2016