Insertion abnormality of bilateral pectoralis minimus.

Bilateral insertion abnormality of pectoralis minimus (sterno-costo-coracoidian muscle) muscle was examined. The variant muscle was lying under the pectoralis major muscle and was medial to the pectoralis minor muscle. This muscle started from the first costal cartilage to the manubrium sterni and ended in the upper surface of the shoulder joint on the right side.