This paper describes our experience with a case of hyperplasia of the unilateral mandibular coronoid process.
The patient was a 25-year-old man. At the age of about 17 years, he realized he had lockjaw but did not do anything about it. Panoramic radiography revealed marked hyperplasia of the right mandibular coronoid process.
Coronoidectomy was performed by an intraoral apploach. As of 2 years after the operation, the mouth can be opened 40mm and jaw movement is normal on magnetic resonance imaging.
