Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiac silhouette size is increased compared to the prior study , now appearing moderate to severely enlarged . Mediastinal contour is unchanged . There is perihilar haziness with increased interstitial opacities suggestive of mild pulmonary edema . This appears to be superimposed on a background of mild chronic interstitial abnormality . No focal consolidation , pleural effusion or pneumothorax is demonstrated . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild pulmonary edema superimposed on a background of mild chronic interstitial abnormality .