Conclusion:
Injuries to the latissimus dorsi and teres major are increasingly reported in baseball pitchers. However, in most countries, baseball is an uncommon sport, and the diagnosis may be challenging because of unfamiliarity with the injury among patients and health care providers. Our case illustrates that classification of these injuries should be clarified to avoid unnecessary surgical treatment recommendations. Several centimeters of retraction of the latissimus dorsi part of the conjoined tendon combined with a sub-total avulsion of the teres major part as in the present case report may be successively treated non-operatively with excellent functional results and return to the same level of gymnastic performance in less than six months post-injury.