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.

Automated summary

Congenital torticollis is most commonly caused by sternocleidomastoid contracture, while torticollis due to unilateral absence of sternocleidomastoid is rare. It is even rarer when ipsilateral absence of sternocleidomastoid and trapezius are associated with cerebellar hypoplasia, as described in an 11-year-old patient.