Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and aortic valve replacement . The heart size is normal . The mediastinal and hilar contours are unremarkable . The lungs are clear . No pleural effusion or pneumothorax is demonstrated . No acute osseous abnormalities seen .
    OUTPUT:
    
No acute cardiopulmonary process .