Migration of Steinmann pins into the thoracic cavity is uncommon, but when occurs it can bring devasting consequences. A Sixty-year-old woman had pinning of the right humerus surgical neck fracture. She was not followed up after discharge Two years later, a chest x-ray film and chest CT showed that the pin had migrated to the right hemithorax. The migrated pins were removed with right anterolateral thoracotomy incision without any difficulties.