Discussion of Fibromatosis colli
- Fibromatosis colli is enlargement of the sternocleidomastoid muscle
- Typically seen as a unilateral neck mass in a neonate, usually at about 2 weeks of age.
- Right-sided in 75% of cases.
- Patient history often includes a difficult delivery, and the mass may enlarge further after its discovery.
 Imaging Findings for Fibromatosis colli
An ill-defined isoechoic or slightly hypoechoic mass is seen enlarging the sternocleidomastoid muscle.
Isoattenuating enlargement of the sternocleidomastoid muscle with no definable mass
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 References for Fibromatosis colli
- Caroline Chiles, Kirkland W. Davis, and Daniel W. Williams, III. Navigating the Thoracic Inlet. RadioGraphics 1999 19: 1161-1176.