Which is the most common childhood CNS tumor metastasize outside brain?: (A) Ependymoma, (B) Glioblastoma multiforme, (C) Choroid plexus tumor, (D) Medulloblastoma
Answer is D. "Medulloblastoma is the childhood brain tumor that most commonly metastasizes extraneuronally."- Nelson 
Also know
There are age-related differences in primary location of tumor.