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Any neoplasm derived from one of the various types of cells that form the interstitial tissue of the brain, spinal cord, pineal gland, posterior pituitary gland, and retina. [G. glia, glue, + -oma, tumor]

- brainstem g. a g., generally an astrocytoma, arising in the medulla, pons, or midbrain.

- gigantocellular g. SYN: giant cell glioblastoma multiforme.

- mixed g. a g. composed of two or more malignant elements, most frequently astrocytoma and oligodendroglioma.

- nasal g. term for a lesion that is probably not a true neoplasm, but a teratoma consisting of glial tissue with reactive astrocytes, ganglionic neurons, and ependymal cells in small nodules at the dorsum of the nose, often with intracranial connections.

- g. of optic chiasm a slow-growing tumor, usually an astrocytoma, of the optic chiasm in children.

- optic nerve g. a g., generally an astrocytoma, involving the optic nerve or chiasm.

- g. of the spinal cord a glial tumor of the spinal cord, commonly an ependymoma; neoplasms of the spinal cord are relatively rare, but gliomas constitute approximately one-fourth of the total.

- telangiectatic g., g. telangiectodes a g. in which the stroma has numerous, conspicuous, frequently dilated small blood vessel s and capillaries, as well as large, endothelium-rimmed lakes of blood.

gli·o·ma glī-'ō-mə, glē- n, pl -mas also -ma·ta -mət-ə a tumor arising from glial cells

gli·o·ma·tous -mə-təs adj

any tumour of non-nervous cells (glia) in the nervous system. The term is sometimes also used for all tumours that arise in the central nervous system, including astrocytoma and glioblastoma. Tumours of low-grade malignancy produce symptoms by pressure on surrounding structures; those of high-grade malignancy may be infiltrative.