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Cerebellar medulloblastoma — MCCQE Part 1 MCQ

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HardHeadacheCerebellar medulloblastomaMCCQE Part 1

A 9-year-old boy has headaches, early morning vomiting, and unsteady gait x 2 months. Bilateral papilloedema, truncal ataxia, dysmetria. MRI: posterior fossa mass with obstructive hydrocephalus. Most likely diagnosis?

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Correct answer: D — Cerebellar medulloblastoma

Posterior fossa mass in school-age child with raised ICP + cerebellar signs = medulloblastoma (most common malignant paediatric brain tumour). Arises from vermis. Treatment: surgery + craniospinal RT + chemo.

Reference: Canadian Paediatric Oncology / SIOP