Medulloblastoma with extensive nodularity - imaging findings of a rare variant: a case report

Medulloblastoma is the most common malignant central nervous system tumor in pediatric patients and the most common primary tumor in the posterior fossa in children, most manifest in patients 5-12 years of age. Clinical features are mainly characterized by intracranial hypertension and ataxia. The authors present a case of medulloblastoma with extensive nodularity, a rare variant which affects younger age usually under three years, with more favorable prognosis. It is typically a cystic lesion in the posterior fossa with solid nodular components that enhance after contrast, like 'bunch of grapes' clusters. Preoperative diagnosis could be suggested by this finding. (author)