Birth injury to the sternomastoid muscle.
D000328:Adult; D001720:Birth Injuries; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007235:Infant, Premature, Diseases / Q000209:etiology*; D007746:Labor Presentation; D009135:Muscular Diseases; D009333:Neck; D011247:Pregnancy