Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and mitral valve replacement . Left - sided AICD / pacemaker device is again noted with leads terminating in the right atrium and right ventricle . Heart size remains mildly enlarged . Mediastinal and hilar contours are similar . Mild pulmonary vascular engorgement is worse compared to the prior study . Atelectatic changes are seen in the lung bases without focal consolidation . No pleural effusion or pneumothorax is present .
    OUTPUT:
    
Mild pulmonary vascular engorgement with mild bibasilar atelectasis .