Inverted Papilloma: The Stubbornly Persistent Tumor of the Sinonasal Cavity

Survivin and cortactin expression in sinonasal schneiderian (inverted) papilloma and associated carcinoma

“…Sinonasal inverted papillomas (IP), or endophytic schneiderian-type papillomas, are uncommon, benign, but locally aggressive epithelial neoplasms that arise from the sinonasal mucosa, 1 with an incidence of 0.74–1.5 cases per 100,000 population per year. 2 Sinonasal IPs generally originate from the lateral nasal wall, ethmoid sinus, maxillary sinus, or, less commonly, from the frontal and sphenoid sinuses 2 (Fig.…”