The document provides an overview of central nervous system (CNS) tumor classification, grading, incidence, clinical presentation, diagnosis, types, pathobiology, and treatment. It discusses various types of glial and non-glial brain tumors such as glioblastoma, astrocytoma, oligodendroglioma, ependymoma, medulloblastoma, and meningioma. It also covers tumor grading systems, common genetic mutations in brain cancers, surgical resection, radiation therapies including stereotactic radiosurgery, chemotherapy, anti-angiogenic and immunotherapies.