Pain while branch passing, and question of left pectoralis tear. There is abnormal signal about 2 cm proximal to the insertional site at the muscular-tendinous junction of the left pectoralis musculature (series #1601, image 17) extending through the left lateral aspect of the pectoralis inferiorly. The insertional site of the pectoralis musculature on the left humerus appears intact. The pectoralis origin appears within normal limits. No other significant findings.
Findings as above are most consistent with a partial tear at the muscular-tendinous junction of the left pectoralis musculature.