Tumors in the brain or spinal cord (CNS tumors) are the second most common cancer in children. Medulloblastoma accounts for about 20% of all CNS tumors in children. The most important factors associated with their tumor are location and if the tumor has spread to other areas of the CNS. Unlike most other CNS tumors, medulloblastoma cells can spread throughout the brain and the spinal cord. Twenty-five to forty percent of medulloblastoma tumors spread far from the primary tumor.

Treatment plans vary depending upon the child's age at diagnosis, amount of tumor removal, and extent of tumor spread. Surgery is the first treatment for medulloblastoma. Total removal is the goal. Medulloblastoma is very responsive to radiation therapy and to many Chemotherapy drugs.

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