Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post mitral valve replacement and probably coronary artery bypass graft surgery . The heart is mildly enlarged . There is patchy basilar opacification suggesting a combination of atelectasis and pleural effusion . Streaky left upper lobe opacity suggests minor atelectasis or scarring which is unchanged . There is no pneumothorax . No free air is demonstrated .
    OUTPUT:
    
Patchy left basilar opacity , highly suggestive of atelectasis in association with a small - to - moderate suspected pleural effusion , although opacification is not entirely specific as the etiology .