Ethmoid Sinus Inverted Papilloma

**Semantic type:** Neoplastic Process

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

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