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Region of interest (ROI) and site for measuring the echogenicity and thickness of the biceps long head (A), subscapularis (B), supraspinatus (C), and infraspinatus tendons (D). Red dashed squares, ROI for the subcutaneous tissue; yellow dashed squares, ROI for the deltoid muscle; white dashed area, ROI for the target tendon; double arrowed line, tendon thickness; white arrowheads, anatomic neck of the humerus.
