Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post coronary artery bypass graft surgery and apparently mitral valve replacement . The heart is mildly enlarged . The mediastinal and hilar contours appear unchanged . There is a slight interstitial abnormality , suggestive of a state of very mild congestion , but no new focal opacity . A left - sided pleural effusion has resolved although mild scarring or atelectasis persists . Bones are probably demineralized .
    OUTPUT:
    
Findings suggesting mild pulmonary congestion . Resolution of small left - side pleural effusion .