Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The mid sternum is fractured and displaced by 10 mm with the superior sternum located posterior to the inferior sternum . There continues to be blunting of the left costophrenic angle posteriorly , which appears to be from chronic pleural thickening . There continues to be a hazy retrocardiac opacity , which may be attributable to atelectasis . Cardiac and mediastinal contours are unchanged . Pulmonary vasculature is normal . No pneumothorax is identified . There are multilevel degenerative changes of the thoracic spine .
    OUTPUT:
    
1 . New mid-sternal fracture with 10 mm of distraction . 2 . No definite rib fracture or pneumothorax . 3 . Retrocardiac patchy opacity which may be attributed to atelectasis .