Optic Nerve Sheath Grade 3 Meningioma

**Semantic type:** Neoplastic Process

**Definition:** A grade 3 meningioma that arises from the sheath of the optic nerve.

**Synonyms:** - Grade 3 Optic Nerve Sheath Meningioma - Malignant Optic Nerve Sheath Meningioma - Optic Nerve Grade 3 Meningioma - Optic Nerve Sheath Malignant Meningioma