Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild pulmonary edema has improved substantially , including the most severe opacification , in the right lower lobe , more likely due to a combination and atelectasis than pneumonia . Small pleural effusions are likely , but difficult to assess with the patient supine . Progression of chronic moderate enlargement of the cardiac silhouette could be due to worsening cardiomegaly and / or pericardial effusion .
    OUTPUT:
    
Mild pulmonary edema improving . Chronic cardiomegaly and / or pericardial effusion increased .