Shoulder impingement caused by distal clavicle osteochondroma

INTRODUCTION: One of the most common causes of shoulder pain is impingement syndrome, several structural changes of acromion, coracoid process, coracohumeral ligament and acroimclavicular joint could cause it; however a rare extrinsic benign tumor such as osteochondromas could also lead to shoulder impingement which could be treated successfully by arthroscopy. CASE REPORT: We presented a successful arthroscopic resection of distal clavicle osteochondroma causing shoulder impingement in a 56-year-old male patient which was not responding to conservative management. CONCLUSION: Shoulder impingement could be caused by a very rare pathology such as osteochondromas. Sever shoulder pain and decrease of shoulder range of motion are common patient symptoms. Plain x-rays and MRI might be enough radiological investigation to reach up a diagnosis. Arthroscopic resection of such lesions considered as safe and effective management approach with low complication rates and recurrence rates.