JAPANESE JOURNAL OF ORAL & MAXILLOFACIAL SURGERY

Vol. 54 No. 8       2008

ISSN: 0021-5163      UBIC: 151-J

ABSTRACT

A case of bilateral coronoid process hyperplasia of the mandible is presented. A 12-year-old boy was referred to our hospital because of limited mandibular movement. He was aware of decreased mouth opening 8 months before presentation. He was treated for TMJ dysfunction at a certain clinic. However, his condition did not improve. His maximum mouth opening was 10 mm (interincisal distance). Panoramic radiography and CT of the mandible revealed bilateral coronoid process hyperplasia, extending above the zygomatic arch. Bilateral coronoidectomies were performed through an intraoral approach under general anesthesia, and continuous mouthopening training was done after surgery. Histopathologically, the specimens were not tumor, but hyperplasia of the coronoid process. After the coronoidectomy, jaw trismus resolved, and no reccurence has occurred. Keywords: hyperplasia of the mandibular coronoid process, limited mandibular movement.

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