Congenital muscular torticollis, also known as sternocleidomastoid tumor of infancy , is a benign condition presenting as a mass in the SCM during the neonatal period due to hematoma formation in the body of the muscle as a result of birth trauma. Infants have their heads tilted to the ipsilateral side and chin pointed in the opposite direction. Ultrasonography confirms the presence of a solid mass in the SCM and initial treatment consists of physical therapy with passive exercises of the neck. Lack of response to conservative measures warrants surgical partial division of the SCM.