Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Scarring and fiducial marker in the right upper lobe is from prior resection and treatment . There is increased interstitial opacities bilaterally , which may represent a combination of chronic scarring and / or pulmonary edema . Heart size is enlarged but stable . Mediastinal contours are enlarged representing venous congestion . No pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Increased interstitial markings potentially due to chronic changes and / or mild pulmonary edema . 2 . No evidence of pneumonia . 3 . Chronic scarring in the right upper lobe from prior treatment .