Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are provided . A focus of scarring in the right upper lobe is better assessed on the prior CT from ___ . Increase in interstitial markings , which could indicate mild interstitial edema or atypical infection . Heart size remains stable . No pneumothorax .
    OUTPUT:
    
Mild interstitial opacity could represent an atypical pneumonia or edema . Otherwise , no change .