Ｏｍｏｈｙｏｉｄ　Ｍｕｓｃｌｅ　Ｓｙｎｄｒｏｍｅ : 臨床的および病理学的特徴とその成因について

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The omohyoid muscle syndrome was first reported by Ye Biyuan in 1980. During swallowing the omohyoid muscle bulges remarkably, while it disappears completely at rest. The pathogenesis is still obscure. Ten young males suffering from this syndrome were documented in his paper.Recently we have encountered a case of fifteen year-old boy who complained of neck bulge in the left during swallowing. He sprained the neck in Feb. 1981 and first noticed his left cervical mass during swallowing in April 1981. He visited our clinic in Feb. 1982 because his cervical mass increased in size.The mass appeared during swallowing and phonation in correspondence with the course of the omohyoid muscle. Operation was carried out under local anesthesia. A transverse skin incision in the left side was made starting from the midpoint of thyroid cartilage. The superior belly of the omohyoid muscle was exposed and found to be hypertropic. The superior belly was excised and the bulge disappeared immediately.The histopathological findings showed the waxy change and the increase in size in some muscle fibers. The pathological diagnosis, therefore, was myogenic atrophy of the omohyoid muscle.The patient is doing well six months after the operation.
社団法人日本耳鼻咽喉科学会の論文