Reason: ? Left pectoralis major tendon tear History: pain, weakness with adduction Multiple sequences are degraded by motion and pulsation artifact limiting evaluation of the pectoralis muscle and tendon. There is marked atrophy of the sternal and clavicular heads of the left pectoralis muscle. The pectoralis tendon can be followed to the anterior edge of the proximal biceps muscle at which point it appears discontinuous from what we suspect to be a pectoralis tendon fragment that is attached to the humerus, although it is difficult to define what is tendon and what may be scar tissue on this study. These findings are suggestive of a chronic tear of the distal pectoralis tendon with the distal end perhaps scarred down to the biceps muscle. We see no edema or hematoma within the muscle or peritendinous structures to indicate an acute injury. We suspect that there is mild osteoarthritis of the acromioclavicular joint.
Markedly limited study due to extensive artifact shows atrophy of the left pectoralis major muscle and what appears to be a tear of the distal tendon. The tendons can be followed to the anterior edge of the biceps at which point it appears discontinuous from a separate low signal intensity structure at the expected site of the insertion of the tendon on the humerus that may represent a tendon stump or scar tissue.