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Background:Some patients present transient swelling on lower lateral neck during swallowing;this condition is known as “omohyoid syndrome” or “omohyoid sling syndrome”as well as to give the reader an appreciation for the proper diagnosis and treatment to this not-uncommon condition. Methods:There were thre cases betwen May, 2000 and January, 2001. The photography, real-time sonography, and computed tomo-graphy (CT) were used. Results:There was a brief report on omohyoid syndrome. The sternocleidomastoid muscle is pas-ively tented up by an underlying omohyoid muscle, and the omohyoid muscle is paradoxically thickened during swallowing. result from lack of its relaxation during laryngeal elevation. Conclusion:The described approaches allow for precise diag-nosis and definite prof of the pathogenetic mechanism. (Korean J Otolaryngol 2002;45:306-9)