[Mouth opening limitation from hypertrophy of the coronoid apophysis]. 
Bilateral generalized enlargement of the coronoid processes is an unusual and rarely reported condition.  In the presented case the alleviation of restriction in mandibular movement was only dependent on bilateral coronoidectomies.  There is a need for clarification of the condition regarding cause, diagnosis and probably terminology as well as possible relationship to osteochondroma of the coronoid processes.