Latissimus dorsi (LD) avulsion injuries are rare injuries most commonly diagnosed in competitive athletes. The LD muscle originates from the thoracic spine, thoracolumbar fascia, and iliac crest, converging toward the axilla to insert between the pectoralis major and teres major tendons, just medial to the bicipital groove of the proximal humerus. Functionally, the latissimus adducts, internally rotates, and extends the humerus. It also acts to depress the arm against resistance, compress the inferior scapula when the arm is elevated, and pull the trunk upward and forward when the arms are fixed.