Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . A left - sided dual - lumen pacemaker device is noted with leads terminating in the right atrium and right ventricle . Heart size remains moderately enlarged but unchanged . Mediastinal and hilar contours are similar . There is mild pulmonary vascular congestion without overt pulmonary edema . Small right pleural effusion appears new in the interval . Streaky bibasilar airspace opacities may reflect atelectasis though infection can not be completely excluded . No pneumothorax is detected . Mild degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Small right pleural effusion with patchy bibasilar airspace opacities , possibly atelectasis though infection is not excluded . Mild pulmonary vascular congestion .