Figures 5, 6. (5) Inferior volume-rendered spiral CT image shows a comminuted fracture of the medial right clavicle (arrow). The medial aspect of the clavicle is displaced posteriorly with respect to the more lateral portions of the bone. The right sternoclavicular joint is disrupted, as manifested by widening of the joint space. The superior ribs and the great vessels were not injured. (6) Inferior volume-rendered spiral CT image shows posterior dislocation of the right sternoclavicular joint (white arrow). A mediastinal hematoma is present (arrowhead); axial contrast material-enhanced images (not shown) demonstrated the site of venous hemorrhage. There is an associated fracture of the right fourth rib (black arrows).