上顎洞内遊離骨片の2症例

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We experienced two cases in which isolated bone fragments were found in the maxillary sinus.<BR>The first case was a 34-year-old man. Radiographic examination showed a radiopaque shadow that appeared to be calcic substance isolated in the left maxillary sinus. It was surgically enucleated with the antral mucous membrance. A histopathological examination revealed the calcic substance was an isolated bone fragment which consisted of a laminated bone tissue and an enclosed connective tissue that had become necrotic, in which there found neither an osteoblast nor osteoclast. Microscopically, the antral mucous membrane contacted to the bone fragment showed chronic inflammatory infiltrate which was a feature of chronic sinusitis.<BR>The second case, which was found in a 33-year-old woman, was clinically suspected of a benign tumor in right maxillary sinus by radiographic examination. The enucleated tissue was a bone fragment in a size of 25×15×5mm. Microscopically, there found bone cells, however, neither osteoblast nor osteoclast were found, which was the same as that described for the first case. The antral mucosa contacted to the bone fragment was edematous, and increased connective tissue consisting of collagen fiber was found in deep layers of the mucosa.