Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Hilar contours are unremarkable . Postsurgical changes from left upper lobectomy with associated volume loss and stable elevation of the left hemidiaphragm . Retrocardiac atelectasis appears has improved . Fluid along the minor fissure has resolved now with a small right - sided pleural effusion . No residual pneumothorax . Lungs otherwise clear . Extensive subcutaneous gas in the left chest wall has improved .
    OUTPUT:
    
Interval improvement of extensive left chest wall subcutaneous gas , retrocardiac atelectasis as well as trace right - sided pleural effusion . No residual pneumothorax .