case_images: PMC9899473_01
case_images: Case 1. Intraoperative photograph showing a supraclavius muscle (*) encountered during left anterior scalenectomy for thoracic outlet syndrome through a supraclavicular approach. C: clavicle, SCM: Sternocleidomastoid.
case_images: SNI-13-600-g001.jpg
case_images: PMC9899473_01_SNI-13-600-g001.jpg
case_images: F1
case_images: An anomalous muscle, distinct from the sternocleidomastoid muscle, was immediately identified traversing the supraclavicular space [Figure 1].
case_images: PMC9899473_02
case_images: Case 2. Intraoperative photograph showing a supraclavius muscle (*) encountered during right anterior scalenectomy for thoracic outlet syndrome through a supraclavicular approach. SCM: Sternocleidomastoid.
case_images: SNI-13-600-g002.jpg
case_images: PMC9899473_02_SNI-13-600-g002.jpg
case_images: F2
case_images: This muscle was itself distinct from the sternocleidomastoid, inserted on the superior aspect of the medial clavicle, and tracked posteriorly across the supraclavicular space before diving deep to the trapezius muscle [Figure 2].