Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior radiograph on ___ , lung volumes are slightly lower . Again noted are bibasilar opacities , which likely represent a combination of pleural effusion and adjacent atelectasis . No evidence of overt pulmonary edema . Heart size appears large , although unchanged from the prior study . Median sternotomy wires are intact . No acute osseous abnormalities identified .
    OUTPUT:
    
Low lung volumes with unchanged appearance of bibasilar opacities that are likely due to a combination of pleural effusion with adjacent atelectasis .