The patient had a left upper chest region contact injury while playing freeze bee. The initial left shoulder radiograph (not uploaded, no copyright) revealed no fracture on the day of injury.

Due to persistent pain, swelling in the left sternoclavicular region, and painful neck and shoulder movements; a shoulder radiograph was repeated which again failed to reveal a fracture. Ultrasound revealed posterior dislocation of the medial end of the left clavicle. The left shoulder ultrasound was normal.

CT angiography was advised to rule out/ rule in upper mediastinal vascular injury. There was no vascular injury.