下顎枝に生じた類腱線維腫の1例

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  • A case of desmoplastic fibroma arising in the ramus of the mandible
  • カガク シ ニ ショウジタ ルイケンセンイ シュ ノ 1レイ

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Desmoplastic fibroma is a benign fibrous tumor of bone, but shows aggressive behavior and has a high rate of recurrence. We present a case of desmoplastic fibroma arising in the ramus of the mandible. The patient was a 13-year-old boy who had been aware of a painless mass in the right periauricular region for one month. The mass gradually increased in size, and pain on opening the mouth developed. He was referred to our department, and on the initial examination, a bony-hard mass was palpated from the right periauricular region to the cheek. CT detected a clearly demarcated unilocular lesion with homogeneous density in the right ramus of the mandible. The lesion extended from the base of the condyle to the mandibular angle, and occupied two thirds the volume of the ramus of the mandible. Clinically, a right mandibular tumor was diagnosed, and the biopsy was done. On histopathological examination, a desmoplastic fibroma was diagnosed. Right segmental mandibulectomy ranging from the condyle and the coronoid process to the mandibular angle was done with the patient under general anesthesia. Some parts of fascia of the masseter and the medial pterygoid muscle were resected. The resected specimen was elastic hard and measured 55 × 45 × 35mm. The cut surface was solid and grayish white. The histopathological diagnosis was desmoplastic fibroma. There was no evidence of local recurrence or metastasis 9 years after operation.

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