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