Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Left - sided dual - chamber pacemaker device is noted with leads terminating in the right atrium and right ventricle , unchanged . Mild cardiomegaly is re - demonstrated . Mediastinal and hilar contours are similar . There is mild pulmonary vascular congestion . Patchy opacities are seen in the lung bases , likely reflective of atelectasis . There may be trace bilateral pleural effusions . Degenerative changes of the right glenohumeral joint are noted .
    OUTPUT:
    
Mild pulmonary vascular congestion and bibasilar atelectasis . Possible trace bilateral pleural effusions .