Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild to moderate cardiomegaly as well as mild pulmonary edema . Right lower lobe and retrocardiac opacities may be atelectasis although underlying infection is difficult to exclude . The patient is status post median sternotomy and CABG . There is a small right pleural effusion . There is no pneumothorax .
    OUTPUT:
    
Mild congestive heart failure with small right pleural effusion . Bibasilar airspace opacities likely reflect atelectasis , but infection is not excluded .