Oncocytic papilloma of the maxillary sinus. A rare and recurrent tumor

: A case of oncocytic schneiderian papilloma of the maxillary sinus arising in a 76 year old man is reported. This particular type of papilloma is rare and is often misdiagnosed for some benign or even malignant lesions. Microscopic features are shown and ultrastructural data are emphasized. The clinical course of this lesion is briefly reviewed with the treatment.