Inverted Papilloma

**Semantic type:** Neoplastic Process

**Definition:** An endophytic benign papillary epithelial neoplasm that results from the invagination and proliferation of epithelial cells in the underlying stroma. Representative examples are the inverted urothelial papilloma that arises from the urinary tract and inverted Schneiderian papilloma that arises from the nasal cavity or paranasal sinuses.

**Synonyms:** - inverted papilloma