Inverted papilloma of the maxillary sinus: Report of two cases

Inverted papilloma of the nasal and paranasal sinuses is an uncommon, histopathologically benign neoplasm. However, because this tumor has an aggressive nature and a risk of recurrence, complete resection is essential.We report two cases of inverted papilloma of the maxillary sinus. Patient 1 was an 80-year-old man with a tumor of the tongue. Accidentally, computed tomography showed a mass of a different density in the maxillary sinus and nasal cavity. The suspected diagnosis was a tumor of the left maxillary sinus. Inverted papilloma was diagnosed on histopathological examination of a frozen-section biopsy specimen, and the tumor was excised under general anesthesia. The postoperative course was uneventful. However, he died of an other disease 18 months after operation. Patient 2 was a 65-year-old man with left nasal obstruction. Computed tomography showed a mass in the maxillary sinus and nasal cavity. The suspected diagnosis was left maxillary sinusitis. Inverted papilloma was diagnosed on histopathological examination of a frozen-section biopsy specimen, and the tumor was excised under general anesthesia. The postoperative course was uneventful, and there has been no evidence of recurrence.