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Gliomas are a common type of brain tumor that develop from glial cells, which are specialized cells that surround and support neurons (nerve cells) in the brain. Gliomas are generally classified based on which type of glial cell is involved in the tumor: Astocytomas are a type of glioma that develop from star-shaped glial cells called astrocytes. Astrocytomas are the most common type of glioma. Ependymomas are another type of glioma that develop from ependymal cells that line the brain and spinal cord. Ependymomas are more likely to affect children than adults.  Optic gliomas affect the optic nerves, which send messages from the eyes to the brain.  Other notable types include diffuse intrinsic pontine gliomas, mixed gliomas, and oligodendrogliomas.