A 22-year-old man who pitches for his collegiate baseball team reports six months of deep, poorly localized right shoulder pain accompanied by an audible click. The pain is worst during the late cocking phase of his throwing motion, and he describes a vague sense that the shoulder is slipping. He denies any single traumatic event or prior dislocation. On examination, forward flexion to 90 degrees with 15 degrees of adduction and the thumb pointing down reproduces his pain, and repeating the maneuver with the palm facing upward relieves it. Rotator cuff strength is full and symmetric. Plain radiographs including an axillary lateral view are unremarkable.
Which of the following imaging studies is most likely to confirm the underlying lesion?
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