Sphenoid Sinus Inverted Papilloma

**Semantic type:** Neoplastic Process

**Definition:** A benign neoplasm that arises from the ciliated respiratory mucosa that lines the sphenoid sinus. It results from the invagination and proliferation of epithelial cells in the underlying stroma.

**Synonyms:** - Inverted Papilloma of Sphenoid Sinus - Inverted Papilloma of the Sphenoid Sinus - Sphenoid Sinus Inverted Schneiderian Papilloma