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Figure 9b.  Subscapularis insertion. (a) Oblique sagittal proton-density–weighted MR image shows the complex insertion site of the subscapularis tendon (straight arrows). The appearance of the distal supraspinatus and infraspinatus tendons is similar (curved arrows). (b) Sagittal (cross-sectional) US image shows similar heterogeneity of the subscapularis tendon near the insertion site on the lesser tuberosity (arrows).