Sometimes childhood medulloblastoma and other central nervous system embryonal tumors come back after treatment.

Childhood medulloblastoma and other types of CNS embryonal tumors most often recur (come back) within 3 years after treatment but may come back many years later. Recurrent childhood medulloblastoma and other CNS embryonal tumors may come back in the same place as the original tumor and/or in a different place in the brain or spinal cord.