Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Left - sided pacemaker device is noted with single lead terminating in the right ventricle . The heart is moderately enlarged . Lung volumes are low . Mediastinal contours are unremarkable . There is mild perihilar haziness and vascular indistinctness compatible with mild pulmonary edema , new compared to the prior study . Small bilateral pleural effusions are present , along with a retrocardiac opacity , possibly reflecting atelectasis but infection can not be excluded . No pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild congestive heart failure with small bilateral pleural effusions . Retrocardiac opacity could reflect atelectasis but infection can not be excluded .