Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are stable . There is no pleural effusion or pneumothorax . Lungs are well expanded and clear . No displaced rib fracture or other fracture is visualized . Note is made of a probable hiatal hernia , present since ___ .
    OUTPUT:
    
No acute cardiothoracic process .