Table 1.

WHO classification of brain tumor grades.

	Grade	Tumor Types	Characteristics
Low Grade	Grade I	Craniopharyngioma Chordomas Ganglioglioma Gangliocytoma Pilocytic astrocytoma	Possibly curable via surgery alone Long-term survival Least malignant (benign) Non-infiltrative
	Grade II	Pineocytoma “Diffuse” astrocytoma Pure oligodendroglioma	Slight infiltrative Relatively slow growing Can recur as higher grade
High Grade	Grade III	Anaplastic ependymoma Anaplastic astrocytoma Anaplastic oligodendroglioma	Malignant Infiltrative Tend to recur as higher grade
	Grade IV	Glioblastoma multiforme Medulloblastoma Ependymoblastoma Pineoblastoma	Most malignant Rapidly growing and aggressive Widely infiltrative Recurrence Tendency for necrosis