Figure 7a. Peri-insertional rotator cuff complexity. (a) Oblique sagittal proton-density–weighted MR image shows the complex appearance of the merging cuff tendons (arrows). This appearance may be observed on clinical images in which high-resolution technique is used. (b) Transverse US image shows the complex "fibrillar" appearance of the rotator cuff (straight arrows) between the overlying deltoid muscle (D) and the underlying humeral head (curved arrows).