Omohyoid Muscle Syndromeの一症例

Abstract

Omohyoid muscle syndrome was reported by R. B. Zachary for the first time in 1969. The syndrome is characterized by remarkable distention of the omohyoid muscle during swallowing, which completely disappear at rest.This case was a 40-year-old male who complained of discomfort of the throat and bulging of the neck during swallowing over several years, and he was diagnosed as having omohyoid muscle syndrome. The operation was performed under local anesthesia in 1990, and the omohyoid muscle was simply transected at superior belly of this muscle. Following the operation, abnormal distension during swallowing completely disappeared. The patient has had no symptoms for 9 months postoperatively and no signs of recurrence have been found.Although the pathogenesis of omohyoid muscle syndrome is still unknown, some investigators have reported that pathological examination of the removed muscle showed myogenic degeneration. In our case, the pathological findings revealed slight degeneration of omohyoid muscle.