Abstract
Bilateral coronoid hyperplasia has a 10 to 30 year age range of onset as a rule, and rare cases are reported. The authors experienced a case of bilateral coronoid hyperplasia which might be an abortive type of Marfan syndrome, and reported the outline and studied the case about both the cause and the aspect of coronoid process growth.The patient, a 16 years old high school student, became aware of but left his trismus as it was. Later, because his trismus became severer, he consulted our faculty and was treated by resection of bilateral coronoid process through oral cavity under general anesthesia. Thereafter the symptom was ameliorated, and ran a favorable course. The shape of coronoid process assumed the aspect which grew forward and upward by X-p findings, and coronoid process removed was not a tumor but only a hyperplasia by pathologic diagnosis. The patient showed a special feature of arachnodactyly, which was possibly an abortive type of Marfan syndrome, but was not definitely diagnosed. It was difficult to surmise the cause from its relation with Marfan syndrome and from other theories proposed to date.
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