a general term for a group of brain or spinal cord cancers; also called astrocytomas, particularly when stage I or II is assigned.

Malignant tumours of glial tissue.

A large category of primary brain tumors that originate from nerve cells called glial cells. There are many specific types of gliomas; see Astrocytes; Glioglastoma Multiforme; Mixed Gliomas; Optic Nerve Gliomas.