Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest was obtained . The patient is status post median sternotomy and CABG . A left - sided pacer device is grossly stable in position . The cardiac silhouette remains enlarged . The mediastinal contours are stable . There is hazy right basilar opacity , likely combination of pleural effusion and atelectasis . Left lung is clear aside from the region obscured by the left pacer battery pack . No overt pulmonary edema is seen .
    OUTPUT:
    
Persistent enlargement of the cardiac silhouette and right basilar opacity which likely represents combination of pleural effusion and atelectasis .