Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly is chronic . Interstitial lung disease is unchanged and extensive . Increased opacities , best seen on the lateral view at the lung bases may represent underlying pneumonia . No pleural effusion .
    OUTPUT:
    
Increased focal opacities at the lung bases may represent pneumonia in the setting of extensive interstitial lung disease .