Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post coronary artery bypass graft surgery . There is increasing basilar retrocardiac opacification , suggesting a similar small - to - moderate pleural effusion with associated opacity , possibly atelectasis , but it is difficult to completely exclude an infectious process . Right basilar opacity is unchanged and also suggests atelectasis . There is also a small pleural effusion on the right .
    OUTPUT:
    
Similar basilar opacities and pleural effusions , allowing for increased lung volumes .