A brain tumor that begins in a glial cell in the brain or spinal cord.

Malignant gliomas are the most common primary tumors of the central nervous system. They are often resistant to treatment and carry a poor prognosis

A rare, most commonly benign tumor on the optic nerve or the optic chiasm (the crossing of the two optic nerves).

Optic gliomas cause pressure and destruction of normal optic nerve tissue. They are most common in children and teens.

Optic gliomas are strongly associated with neurofibromatosis.