papilloma inverted papilloma 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. DOID:3179 ICD9:212.0 MESH:D018308 MONDO:0002537 NCIT:C3793 SCTID:104081000119103 UMLS:C0206721 inverted papilloma inverted papilloma, squamous cell