20 year-old male with left shoulder pain during weight lifting The distal pectoralis tendon is intact at its insertion on the humerus. However, there is edema within the sternal head of the pectoralis major muscle with mild retraction of the muscle fibers as well as slightly increased signal intensity on the T1 weighted images, suggesting a grade 2 myotendinous injury of the sternal head. Mild edema is noted within the clavicular head, which otherwise appears intact. There is also mild edema juxtaposed between the long head of the triceps and latissimus muscles suggesting a mild strain. The remaining muscles appear normal, including the contralateral pectoralis musculature. The bone marrow signal is within normal limits. Please note this exam was not protocoled for evaluation of the rotator cuff.
Grade 2 myotendinous injury of the sternal head of the left pectoralis musculature as described above.