Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the most recent radiograph performed earlier on the same date , the right sided pneumothorax appears minimally enlarged . No pneumothorax on the left . There is severe upper lobe predominant emphysema . Bibasilar interstitial abnormalities are overall similar in appearance . Remainder of the lungs are otherwise free of consolidation . Heart size is normal .
    OUTPUT:
    
Slight interval enlargement of the right pneumothorax since 4 hr earlier .