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Comparison between the proximal sternocostal heads of the pectoralis major muscles. The right one (DIR) on its normal aspects and the left one (ESQ) presenting thickened and increased echogenicity.
In the middle portion of the muscle, it is possible to observe only a few muscle fibres and a significant amount of fluid occupying its place. Deep is the pectoralis minor, preserved. Sternal head of the pectoralis identified contracted in the left axillary portion.