CNS Tumors Central nervous system (CNS) tumors are abnormal growths that involve the central nervous system. Types of central nervous system (CNS) tumors include: Glioblastoma multiforme (GBM) Meningioma Schwannoma Oligodendroglioma Pilocytic astrocytoma Medulloblastoma Ependymoma Craniopharyngioma Approximately 50 percent of central…