malignant, optic, grade, human, cerebral, recurrent, supratentorial, anaplastic, intracranial, mixed, primary, low, hypothalamic, nasal, astrocytic, chiasmal, experimental, pediatric, diffuse, benign, brain, pontine, intramedullary, chiasmatic, lowgrade, temporal, spinal, bilateral, highgrade, hemispheric, progressive, induced, intrinsic, multiple, intracerebral, visual, cerebellar, exophytic, intraorbital, frontal, multifocal, cystic, infiltrative, multicentric, retinal, thalamic, growing, untreated, peripheral, intranasal, differentiated, orbital, inoperable, subependymal, posterior, intraspinal, tectal, unilateral, focal, cortical, spontaneous, familial, associated, indolent, adult, diencephalic, symptomatic, chordoid, limbic, recidivous, extranasal, unclassified, ependymal, parietal, invasive, undifferentiated