Question

question 32 (mandatory) (2 points) a 5 - year old boy presents with projectile vomiting and progressive ataxia. workup finds obstructive hydrocephalus due to an infiltrative tumor originating in the cerebellum. what is the most likely diagnosis for this tumor of the cerebellum? oligodendroglioma medulloblastoma ependymoma glioblastoma multiforme

Explanation:

Medulloblastoma is a common malignant brain - tumor in children, often arising in the cerebellum. It can cause symptoms like projectile vomiting due to increased intracranial pressure from obstructive hydrocephalus and ataxia related to cerebellar function impairment. Oligodendrogliomas are more common in the cerebral hemispheres in adults. Ependymomas can occur in the cerebellum but are less typical in this context compared to medulloblastoma. Glioblastoma multiforme is a high - grade glioma more common in adults and not the most likely in a 5 - year - old with a cerebellar tumor.

Answer:

B. Medulloblastoma