Malignant Optic Nerve Non-Teratoid Medulloepithelioma

**Semantic type:** Neoplastic Process

**Definition:** A rare malignant embryonal neoplasm that arises from primitive medullary epithelium and affects the optic nerve. It does not contain heterologous elements and usually occurs in boys.

**Synonyms:** - Optic Nerve Malignant Non-Teratoid Medulloepithelioma