Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and mitral valve replacement . Heart size is mildly enlarged but unchanged . The mediastinal and hilar contours are stable . Pulmonary vasculature is normal . No focal consolidation , pleural effusion or pneumothorax is demonstrated . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .