Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear unchanged . The lungs appear clear . There are no pleural effusions or pneumothorax . There is no free air . Mild degenerative changes are noted along the mid thoracic spine near the site of maximum mild - to - moderate rightward convex curvature .
    OUTPUT:
    
No evidence of acute disease including no free air .