下顎頭の前方滑走障害の原因となった側頭骨関節隆起部骨形成線維腫の1例

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  • A case of ossifying fibroma of the articular eminence of the temporal bone causing restriction of condylar movement anteriorly
  • カガクトウ ノ ゼンポウ カッソウ ショウガイ ノ ゲンイン ト ナッタ ソクトウコツ カンセツ リュウキブコツ ケイセイ センイ シュ ノ 1レイ

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Restriction of condylar movement anteriorly due to lesions of the articular eminence of the temporal bone is rare. In addition, to our knowledge, ossifying fibroma of this region has not been reported previously. We report a very rare case of ossifying fibroma of the articular eminence of the temporal bone. A 27-year-old man came to our hospital because of disturbance of mouth opening and pain of the left temporomandibular joint. Clinical examination showed that the maximum range of mouth opening was 25 mm. Disturbance of mouth opening had been present for about 7 months. Computed tomography revealed a 21 × 9 × 7 mm hard tissue lesion arising in the articular eminence of the temporal bone. The tumor was surgically excised with the patient under general anesthesia. The pathological diagnosis was ossifying fibroma. Three months after surgery, a residual or recurrent tumor developed. However, since the growth of tumor has been either slow or standstill, functional disorder of the temporomandibular joint has not developed as of 2 and a half years after operation.

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