Teenager who while wrestling heard a popping noise and now has right sided sternal pain

3D CT of posterior sternoclavicular joint dislocation
CT 3D reconstruction without contrast of the sternoclavicular joints viewed from anteriorly (above) and from underneath (below) shows widening of the right sternoclavicular joint space when compared to the left sternoclavicular joint space. The right clavicular head is also displaced posteriorly when compared to the left sternoclavicular head.

The diagnosis was right posterior sternoclavicular joint dislocation.