Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly improved . Bibasilar opacities are unchanged . Small right pleural effusion has decreased . Small left pleural effusion is probably unchanged . Mild pulmonary edema appears unchanged . Moderate severe cardiomegaly is unchanged .
    OUTPUT:
    
1 . Slightly improved lung aeration . Decreased right pleural effusion . 2 . Bibasilar opacities may reflect atelectasis or developing pneumonia in the appropriate clinical setting . 3 . Mild pulmonary edema is unchanged .