Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a dual - lead pacemaker / ICD device with leads again terminating in the right atrium and ventricle , respectively . The patient is status post sternotomy and aortic valve replacement . The cardiac , mediastinal and hilar contours appear unchanged . There is persistent extensive left lower lobe opacification which is not specific but could be seen with persistent , although somewhat improved , combination of atelectasis and pleural effusion . Streaky right mid lung opacity was also present before and more suggestive of scarring or atelectasis . A small pleural effusion on the right may have decreased mildly .
    OUTPUT:
    
Mild improvement in left lower lobe opacity and pleural effusion .