Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and aortic valve replacement . Heart size is borderline enlarged , unchanged . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is demonstrated . No acute osseous abnormality is detected including no displaced fractures .
    OUTPUT:
    
No acute cardiopulmonary abnormality . No displaced fractures are visualized .