Abstract

A case of bilateral coronoid hyperplasia resulting in severe limitation of mandibular motion has been presented and the literature has been reviewed. This brings the total number of reported cases to twenty-one. As in all the previous cases, this patient was male and the onset of his disorder was at the age of puberty. The coronoid processes were elongated but not malformed. The weight of evidence from the reported cases supports the contention of Rowe and others that there is an etiologic difference between unilateral and bilateral coronoid hyperplasia. Whether or not the bilateral hyperplasia is as rare as has been reported remains to be seen. It is hoped that as more practitioners become aware of the disorder, more patients may be identified and helped.

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