Astrocytoma

In neurology and oncology, an 'astrocytoma is a neoplasm of the central nervous system, which originates in normal astrocytes. Under the 1993 World Health Association criteria, a glioblastoma can be considered a "high-grade" (Grade IV) astrocytoma; grade III anaplastic astrocytomas are also malignant. The lower-grade astrocytomas may progress to higher-grade