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Brain Cancer - The presence of malignant cells/tumors in the brain. The brain and spinal cord together make up the central nervous system. Tumors that start in the brain are called primary brain tumors. Primary brain tumors are classified by the type of cell in which the tumor began, the specific location of the tumor, and the grade of the tumor. Some types of adult brain tumors include the following: brain stem gliomas, pineal tumors, astrocytomas, glioblastoma multiforme, oligodendroglial tumors, mixed gliomas, ependymal tumors, medulloblastomas, meningeal tumors, germ cell tumors, and craniopharyngiomas. When tumors spread (metastasize) to the brain from another part of the body, they are called secondary brain tumors.
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