Subependymoma

**Semantic type:** Neoplastic Process

**Definition:** A benign, slow growing neoplasm which is typically attached to a ventricular wall. It is composed of glial tumor cell clusters embedded in an abundant fibrillary matrix with frequent microcystic change. Some lesions have the histological features of both subependymoma and ependymoma. It is often detected incidentally and has a very favorable prognosis. (Adapted from WHO.)

**Synonyms:** - SUBEPENDYMOMA, BENIGN - Subependymal Astrocytoma - Subependymal Glioma - Subependymal Glioma - Subependymal glioma - WHO Grade 1 Ependymal Neoplasm - WHO Grade 1 Ependymal Tumor - WHO Grade I Ependymal Neoplasm - WHO Grade I Ependymal Tumor - Who Grade I Ependymal Neoplasm - Who Grade I Ependymal Tumor