Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal . The hilar and mediastinal contours are normal . In comparison to prior examination , there has been interval decrease of the right sided pneumothorax . There is elevation of the right hemidiaphragm . The left lung is clear . Rib fractures are seen bilaterally , likely related to post surgical changes .
    OUTPUT:
    
Interval improvement of right - sided pneumothorax .