Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . Mild unfolding of the thoracic aorta appears unchanged . The cardiac , mediastinal and hilar contours appear unchanged . There is no pleural effusion or pneumothorax . The lungs appear clear . There has been no significant change allowing for differences in technique including better inspiration on this examination . There is no free air . Bony structures are unremarkable .
    OUTPUT:
    
No evidence of acute disease .