Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A central venous catheter again terminates in the superior vena cava . The heart is normal in size . The mediastinal and hilar contours appear unchanged . The lungs appear clear . There are no pleural effusions or pneumothorax , or free air .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease or free air .