PMC9899473_01
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.
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PMC9899473_01_SNI-13-600-g001.jpg
F1
An anomalous muscle, distinct from the sternocleidomastoid muscle, was immediately identified traversing the supraclavicular space [Figure 1].
PMC9899473_02
Case 2. Intraoperative photograph showing a supraclavius muscle (*) encountered during right anterior scalenectomy for thoracic outlet syndrome through a supraclavicular approach. SCM: Sternocleidomastoid.
SNI-13-600-g002.jpg
PMC9899473_02_SNI-13-600-g002.jpg
F2
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].