Can you tell me about brain tumor called an anaplastic astrocytoma?

Astrocytoma. Anaplastic astrocytoma is a rare malignant brain tumor. Astrocytomas are tumors that develop from certain star-shaped brain cells called astrocytes. Grades i or ii astrocytomas are nonmalignant and may be referred to as low-grade. Grades iii and IV astrocytomas are malignant and may be referred to as high-grade astrocytomas.