下顎骨筋突起部骨軟骨腫の切除後，頬骨弓欠損部を前頭骨外板により再建した１例

Abstract

Osteochondroma is composed of bony and cartilagenous tumor elements.Its occurrence at the mandibular coronoid process is relatively rare.A 43-year-old man was referred to our hospital with a chief complaint of severe trismus. His mouth could be opened by only 11mm.A 3×4cm mushroom-like mass was detected at the left coronoid process by computed tomography.A transzygomatic approach was used under general anesthesia. A frontotemporal curve skin incision was made to expose the zygomatic region. After removal of the zygomatic arch, the tumor was excised with the coronoid process.The resected zygomatic arch was reconstructed with the outer cortical layer of the frontal bone. Postoperative limitation of mouth opening was remarkably improved.The amount of mouth opening increased to 23mm immediately after operation, and remarkably improved to 49 mm after one year.