A case of inverted papilloma coexisting with a large radicular cyst.

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Inverted papilloma is an uncommon, benign epithelial tumor of the paranasal sinuses and nasal cavity. The patient, a 32-year-old male, came to our clinic because of discomfort in the palate. Radiography showed clouding of the left maxillary sinus. Contrast radiography showed a large well-defined oval radiopaque structure at the apex of the upper left canine. Computed tomography revealed a mass covering the posterior wall of the left maxillary sinus. The clinical diagnosis was a maxillary sinus tumor coexisting with a large radicular cyst. The mass of polypoid tissue and the cyst were removed from the left maxillary sinus by Caldwell-Luc sinusotomy. The pathological diagnoses were inverted papilloma and radicular cyst. Postoperative course was uneventful, and the patient has remained free of disease for one year following surgery.