Tanycytic Ependymoma

**Semantic type:** Neoplastic Process

**Definition:** A variant of ependymoma, often found in the spinal cord, with tumor cells arranged in fascicles of variable width and cell density. Ependymal rosettes are generally absent, so this lesion must be distinguished from astrocytic neoplasms, but its EM characteristics are ependymal. (Adapted from WHO.)

**Synonyms:** - Tanycytic ependymoma