上顎左側臼歯部硬口蓋に発生した巨大な周辺性骨腫の1例

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A 41-year-old woman was referred by her dentist because of a tumor mass in the left maxilla which interfered with swallowing and speech. She first noticed a small and painless mass about 20 years ago.<BR>Macroscopic examination showed a pedunculated tumor mass, the size of hens egg, attached to the hard palate of the left maxillary molar region.<BR>The radiographic examination revealed a densely radiopaque rim surrouding a central region showing a slightly ground glass-like pattern.<BR>Histologically, the specimen consisted of a rim of compact bone enclosing a central area of cancellous bone. The marrow spaces contained the fatty or fibrous tissue.<BR>The diagnosis was cancellous osteoma.