Carcinoma ex oncocytic Schneiderian (cylindrical cell) papilloma

Schneiderian Papillomas: Comparative Review of Exophytic, Oncocytic, and Inverted Types

“…8,19 Similar to IP, numerous intraepithelial mucuscontaining microcysts can be seen within the epithelium; however, the diffuse oncocytic nature of the epithelium distinguishes OSP from the other sinonasal papillomas. 8,20 OSP must be differentiated from well-differentiated adenocarcinoma by the presence of stratified epithelium, intact basement membranes, and the absence of nuclear pleomorphism, mitotic activity, and bony destruction.…”

Schneiderian Papillomas and Nonsalivary Glandular Neoplasms of the Head and Neck

“…Approximately 4 -17% of all OSPs may harbor a carcinoma (2,70,74,75). Most of these are squamous, but mucoepidermoid, 'transitional,' and sinonasal undifferentiated carcinomas have also been described (74,75).…”

“…Most of these are squamous, but mucoepidermoid, 'transitional,' and sinonasal undifferentiated carcinomas have also been described (74,75).…”

Advances in endoscopic resection of sinonasal neoplasms

“…A pathologic review of 800 cases of sinonasal papilloma found that inverted papilloma is the most common of these subtypes, accounting for 70% of cases [9]. Cylindrical cell papillomas accounted for 19% of cases and fungiform papillomas made up 11% of cases.…”

“…Although all three subtypes are histologically benign, inverted and cylindrical cell papillomas have been reported to be associated with malignancy. Malignancy association rates have ranged from 4% to 17% for inverted papilloma and from 9% to 13% for cylindrical cell papilloma [8][9][10][11].…”