Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is probable background COPD , with parenchymal scarring . Heart size is at the upper limits of normal , borderline enlarged . There is mild upper zone redistribution . There are increased interstitial markings and peribronchial cuffing . There are some more focal areas of increased markings in the left mid and lower zones and right base medially . The significance of this is uncertain , including whether represents an acute or chronic finding . This could represent a combination of parenchymal scarring and CHF or an infectious or inflammatory infiltrate . No frank consolidation or air bronchograms and no effusion is identified .
    OUTPUT:
    
Probable background COPD . Increased interstitial markings in both lungs . Please see comment above .