Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Left - sided AICD / pacemaker device is noted with leads terminating in the right atrium and right ventricle . The heart is mild to moderately enlarged but unchanged . The mediastinal contours are stable . Lung volumes are low which causes crowding of the bronchovascular structures . Additionally , there is mild pulmonary vascular congestion . No pleural effusion , focal consolidation or pneumothorax is present . Minimal patchy opacities in the lung bases likely reflect atelectasis .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis and mild pulmonary vascular congestion .