- Etiology: birth trauma -> sternocleidomastoid muscle hemorrhage / pressure necrosis -> fibrosis -> contracture of sternocleidomastoid muscle – or – in-utero compression of muscle
- Imaging: fusiform thickening and shortening of sternocleidomastoid muscle lower half
- US: modality of choice, variable echogenicity, calcific foci suggest prior hemorrhage, discrete mass should not be seen
- Treatment: conservative range of motion therapy
- Clinical: presents with torticollis in first few weeks of life, chin turned away from affected side, right > left
Radiology Cases of Fibromatosis Colli


