Fibromatosis Colli

Fibromatosis Colli

Fibromatosis colli is benign focal or fusiform enlargement of the sternocleidomastoid muscle in infants that usually regresses by 6 to 8 months of age.

It is thought to be due to trauma to the sternocleidomastoid muscle or to a positioning abnormality in utero.

Ultrasound of the muscle shows either diffuse enlargement or a focal hyperechoic mass.

MRI shows low signal intensity on T2-weighted images due to fibrosis in the sternocleidomastoid muscle.


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