Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest ___ at 12 :27 are submitted .
    OUTPUT:
    
A left - sided pacer remains in place . Cardiac and mediastinal contours are stable in this postoperative patient status post median sternotomy . There are small bilateral layering effusions with patchy bibasilar opacities , left greater than right , suggestive of atelectasis , although early pneumonia can not be excluded . The interstitium is prominent which may reflect stable mild edema or chronic interstitial changes . Comparison to more remote studies would be helpful . No pneumothorax . Aortic calcification consistent with atherosclerosis . Degenerative changes in the thoracic spine with no acute bony abnormality appreciated .