This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Childhood Tumors, Subject name: Pediatrics
Which of the following childhood tumors show extracranial metastasis? 
Select and explain. 
A. Glioblastoma multiforme, B. Medulloblastoma, C. Choroid plexus carcinoma, D. Ependymoblastoma
B: Medulloblastoma
Answer: B: Medulloblastoma 
Explanation: b. Medulloblastoma(Ref: Nelson's 20/e p 2453-2460, Ghai 8/e 612-613)Among the given options, Medulloblastoma is the most malignant brain tumor seen in children. Up to 30% of patients with medulloblastoma present with neuroimaging evidence of leptomeningeal spread.