Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Moderate enlargement of cardiac silhouette is unchanged . Aortic knob calcifications are re- demonstrated . There is mild pulmonary vascular engorgement , but no overt pulmonary edema . Patchy retrocardiac and right basilar opacity could reflect atelectasis . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Moderate enlargement of cardiac silhouette with mild pulmonary vascular congestion but no overt edema . Mild bibasilar atelectasis .