Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . There is mild unfolding and calcification along the thoracic aorta . The mediastinal and hilar contours appear unchanged . There is similar moderate relative elevation of the right hemidiaphragm . Mild scarring at each lung apex is similar . The lungs appear clear . There are no pleural effusion or pneumothorax . Mild degenerative changes are similar along the thoracic spine .
    OUTPUT:
    
No evidence of acute disease .