下顎骨筋突起部の骨過形成により開口障害をきたした1例

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Trismus may be caused by acute or chronic inflammation, ankylosis of TMJ, scar tissue, and neoplastic, myogenic, neurologic and traumatic changes including fracture.<BR>This paper described a rare case of trismus caused by hyperplastic coronoid process.<BR>A 12-year-old girl complained of restricted mandible movement and swelling of the right coronoid region in our clinic. A routine x-ray examination and computed tomography revealed bony masses at the top of the right coronoid process, zygomatic arch and the posterior part of the lateral wall of the maxilla. An operation was performed to resect bony masses of the right coronoid process and zygomatic arch.<BR>Histologically, the resected specimen showed a well-arranged cartilage cells on the surface with fibrous and cartilage ossification. As a whole, abnormal resorption and formation of bone tissues were observed. The histological diagnosis of hyperplasia of the right coronoid proces was made.<BR>Among various cases of trismus due to coronoid process change, our case of trismus due to hyperplasia of the coronoid process seems to be rare.