Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest was obtained . The patient is status post median sternotomy and aortic valve replacement . There is mild left base atelectasis . No definite focal consolidation is seen . There is no pleural effusion or pneumothorax seen . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Right base atelectasis . Stable enlargement of the cardiac silhouette .