Extensive supratentorial and leptomeningeal dissemination in a child with large cell/anaplastic medulloblastoma

Of the posterior fossa tumors in children, 30-40% are due to medulloblastomas. We report a 4-year-old boy, who presented with vomiting and headache, and was subsequently diagnosed with anaplastic medulloblastoma. Neuroimaging revealed a posterior fossa mass, with unusual extensive supratentorial and leptomeningeal dissemination, illustrating the aggressive nature of this tumor.