Teenager who was hit hard during a hockey game who now has right chest pain

CT of sternoclavicular joint dislocation
3D CT without contrast of the chest viewed anteriorly (above) shows normal alignment of the left sternoclavicular joint and malalignment of the right sternoclavicular joint. 3D CT viewed from above (below) shows the right clavicular head is displaced posteriorly to the manubrium of the sternum when compared to the left clavicular head.

The diagnosis was right posterior sternoclavicular joint dislocation.