Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged since the prior study . Aside from right suprahilar scarring , which is also unchanged , the lungs appear clear . There are no pleural effusions or pneumothorax . Mild - to - moderate degenerative changes are noted along the thoracic spine .
    OUTPUT:
    
No evidence of acute disease ; unchanged appearance .