Unilateral Absence of Sternocleidomastoid and Ipsilateral Trapezius Presenting as Congenital Torticollis: A Case of a Rare Entity.

The most common cause of congenital torticollis is sternocleidomastoid contracture. Torticollis due to a unilateral absence of sternocleidomastoid is very rare. Association of an ipsilateral absence of sternocleidomastoid and trapezius with cerebellar hypoplasia is even rarer. We describe a combination of these rarities in an 11-year-old patient with congenital torticollis.