There are many types of brain and spinal cord tumors. The tumors are formed by the abnormal growth of cells and may begin in different parts of the brain or spinal cord. Together, the brain and spinal cord make up the central nervous system (CNS).
The tumors may be either benign (not cancer) or malignant (cancer):
When a tumor grows into or presses on an area of the brain, it may stop that part of the brain from working the way it should. Both benign and malignant brain tumors cause signs and symptoms and need treatment.
Source: Adult Central Nervous System Tumors Treatment (PDQ®)–Patient Version originally published by the National Cancer Institute
An adult central nervous system tumor is a disease in which abnormal cells form in the tissues of the brain and/or spinal cord.