Central Nervous System Embryonal Tumor, Not Otherwise Specified with Leptomeningeal Spread

**Semantic type:** Neoplastic Process

**Definition:** A central nervous system embryonal tumor, not otherwise specified which has spread from its original site to the leptomeninges surrounding the brain and spinal cord.

**Synonyms:** - Central Nervous System Embryonal Tumor, NOS with Leptomeningeal Spread - Primitive Neuroectodermal Tumor with Leptomeningeal Spread