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Related to congenital torticollis: plagiocephaly
torticollis due to a unilateral fibrous tumor in the sternocleidomastoid muscle, present at birth as a swelling that may subside or may lead to torticollis by shortening of the muscle.
Synonym(s): muscular torticollis
Aetiology Congenital form—unclear—possibly due to in utero or peripartum trauma to venous drainage, causing asymmetric development of the face and skull; the later it is recognised, the more likely it will require surgery