Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . The lungs are clear . There is no pleural effusion or pneumothorax . No displaced rib fractures are present . The sternum appears intact on the lateral view . No subdiaphragmatic free air is appreciated .
    OUTPUT:
    
No acute cardiopulmonary abnormality ; specifically , no pneumothorax .