Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and aortic and mitral valve replacements . Mild to moderate enlargement of the cardiac silhouette is unchanged . The mediastinal and hilar contours appear similar . Mild upper zone vascular redistribution suggests mild pulmonary vascular congestion . Patchy atelectasis is present in the lung bases without focal consolidation . No pleural effusion or pneumothorax is identified . Hypertrophic changes are again noted in the thoracic spine as well as the left shoulder .
    OUTPUT:
    
Mild pulmonary vascular congestion and bibasilar atelectasis .