Ethmoid Sinus Primary Ectopic Meningioma

**Semantic type:** Neoplastic Process

**Definition:** An extremely rare meningioma that arises as a primary ectopic tumor in the ethmoid sinus.

**Synonyms:** - Ethmoidal Sinus Primary Ectopic Meningioma - Primary Ectopic Meningioma of Ethmoid Sinus - Primary Ectopic Meningioma of Ethmoidal Sinus - Primary Ectopic Meningioma of the Ethmoid Sinus - Primary Ectopic Meningioma of the Ethmoidal Sinus