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This year, I estimate that 450 to 500 children in the U.S. will be diagnosed with medulloblastoma, making it the most common malignant brain tumor in children. (8) Although medulloblastoma occurs in adults, the tumor is 10 times more common in children.
Among children, the most common tumor types are: 1  Medulloblastoma: The tumor usually arises in the cerebellum. 2  Grade I or II astrocytoma: In children, this low-grade tumor occurs anywhere in the brain. 3  Ependymoma: The tumor arises from cells that line the ventricles or the central canal of the spinal cord.