Answer :USMLE step 2 Mcq 310:A 10 year old male child presents




Correct Answer: C

This is a typical presentation of a medulloblastoma, though the median age at diagnosis is 5-6 years. A medulloblastoma arises in the cerebellum, and is often midline in the nodulus. It may project into ventricle or progress into brainstem An MRI is likely to show a midline cerebellar mass extending into and filling the 4th ventricle. Signs and symptoms include: symptoms of midline cerebellar dysfunction (truncal ataxia), plus increased intracranial pressure in posterior fossa and hydrocephalus due to fourth ventricle occlusion (headache, nausea, vomiting, papilledema)


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