Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is mildly enlarged . Patient is status post median sternotomy and CABG . There has been interval decrease in left pleural effusion , with trace pleural effusion remaining , and overlying atelectasis . No right pleural effusion is seen . There is no pneumothorax . No overt pulmonary edema is seen .
    OUTPUT:
    
Trace left pleural effusion , decreased compared to the prior study , with overlying atelectasis . No overt pulmonary edema .