Astrocytoma

**Semantic type:** Neoplastic Process

**Definition:** A tumor of the brain or spinal cord showing astrocytic differentiation. It includes the following clinicopathological entities: pilocytic astrocytoma, diffuse astrocytoma, anaplastic astrocytoma, pleomorphic xanthoastrocytoma, and subependymal giant cell astrocytoma.

**Synonyms:** - Astrocytoma, NOS - astrocytoma