A glioma is a common kind of primary brain tumourthat begins in the brain or spinal cord—they make up 30% of all brain and central nervous system tumours and 80% of all malignant brain tumours. Called glioma because it arises from glial cells (non-neuronal cells that support and provide protection to neurons in the brain and peripheral nervous system) it is usually found in the cerebral hemisphere of the brain—the largest, outermost part of the organ— that controls many vital functions including movement, speech, thinking, and emotions. In some case a glioma can also affect the brain stem— the lower part of the brain— that controls functions like breathing, blood pressure and heartbeat, the optic nerve and the cerebellum, a part of the brain that deals with balance and other non-cognitive functions.

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