Ortho Dx: A rare source of shoulder pain

 

A 40-year-old man presents with left shoulder pain of several months' duration. Overhead activities and lifting objects with the left arm seem to aggravate the pain. The man denies any known injury or precipitating event. Anteroposterior and outlet view radiographs are ordered. On examination, the patient has positive impingement signs, pain to palpation over the anterior ...