Figure 12a. Rotator interval. (a, b) Oblique sagittal proton-density–weighted MR image (a) and oblique sagittal fat-suppressed T1-weighted MR image obtained after intraarticular injection of dilute gadolinium (b) show the biceps tendon (straight arrow in a) coursing within the rotator interval deep to the capsule and coracohumeral ligament (curved solid arrows), anterior to the supraspinatus tendon (open arrows), and superior to the subscapularis tendon (arrowheads). (c) Transverse US image of the rotator interval shows the biceps tendon coursing between the supraspinatus (SUPRA) and subscapularis (SUBSCAP) tendons. The overlying capsule and coracohumeral ligament are visible (arrows).