Sports Health Orthopaedic Magnetic Resonance Imaging Challenge

A 16-year-old right-hand-dominant boy who is a competitive swimmer presents with dominant shoulder pain. He is referred by his family care doctor and another orthopaedic surgeon, who are concerned about shoulder instability based on radiographs that they interpret as a Hill-Sachs lesion. The patient reports that the injury occurred about a month before presentation, when he fell directly onto his right shoulder while surfing in the ocean. He had immediate onset of pain but did not have a sensation of instability of the shoulder. Anteroposterior (AP) radiographs in internal and external rotation, axillary radiographs, and T2-weighted magnetic resonance imaging (MRI) studies are provided. What are the findings? What is the diagnosis?