CTICasesPosterior Sternoclavicular Joint Dislocation
Imaging findings
A trauma patient has a posterior dislocation of the right clavicle, which is displaced directly behind the sternoclavicular joint. The abnormality is essentially invisible on the chest radiograph because the displacement is purely posterior, but CT shows the posteriorly displaced clavicle nutcrackering and impinging on the brachiocephalic vein.
Key takeaways
A posterior sternoclavicular dislocation can be radiographically occult because the clavicle displaces straight backward rather than laterally, so it is easily missed even when specifically sought on the radiograph. CT is required to demonstrate the posterior displacement and to assess the important complication of impingement on the adjacent brachiocephalic vein and mediastinal vessels.
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