抄録
Osteoma, a benign proliferative bony lesion, is an uncommon lesion in the maxillary sinus. We report a case of ring-shaped osteoma with stratified squamous epithelium in the left maxillary sinus. A 55-year-old man was referred to our clinic because of a radiopaque lesion in the sinus. Computed tomography disclosed a bulky highdensity mass with a cavity. The mass was pedunculated and extended from the inferior to the posterior walls of the left maxillary sinus. The mass was extirpated by opening the maxillary sinus from the canine fossa under general anesthesia. The histopathological diagnosis was osteoma consisting mainly of spongeous bone, partially overlaid with pseudostratified ciliated epithelium and containing granulation tissue covered by stratified squamous epithelium. The clinical features, histopathology, and pathogenesis of osteoma in the maxillary sinus are discussed.
