This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Pathology
A 10-year-old girl develops ataxia and hydrocephalus. CT scan shows a midline cerebellar mass. Which of the following is the most likely diagnosis 
Select and explain. 
A. Meningioma, B. Medulloblastoma, C. Neurofibroma, D. Astrocytoma
B: Medulloblastoma
Answer: B: Medulloblastoma 
Explanation: Medulloblastoma is a cerebellar midline tumor that presents commonly in the pediatric population. These tumors are rapidly growing and often cause hydrocephalus. Ref:- Harsha Mohan textbook of Pathology