下顎骨に発生した粘液腫の臨床病理学的検討

概要

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We analyzed 7 myxomas of the mandible clinicopathologically. Age at the initial visit ranged from 23 to 43 years (mean 34.3 years). Only one case was localized in the anterior portion of the mandible. The other cases mainly extended from the premolar to molar region. Three cases involved the ascending ramus.<BR>Radiologically, 3 cases showed unilocular radiolucency and 4 cases a honeycomb appearance. Two cases had an ill-defined margin and another 2 had unerupted teeth in the tumor.<BR>Histologically, the nyxomas were classified into two types: type I had minimal fibrous components and type II had relatively large amounts of fibrous tissue in the tumor. Three cases were type I and 4 cases type II. With regard to the relationship between histologic type and capsule of the tumor, type II tended to show a distinct capsule, whereas type I showed an unclear capsule. There was no case with odontogenic epithelium in the tumor.<BR>For treatment, enucleation followed by curettage was performed in 2 cases, enucleation followed by cryosurgery in 3 cases, marginal resection in 1 case, and segmental resection in 1 case. There is no evidence of recurrence in any case.