Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Diffusely increased heterogeneous opacities bilateral lung or on the right than left likely represent mild pulmonary edema superimposed on background interstitial lung disease . SMALL BILATERAL pleural effusion . Cardiac silhouette mildly enlarged , similar to before .
    OUTPUT:
    
Mild pulmonary edema superimposed on background interstitial lung disease .