Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . Slight subpleural scarring is noted at each lung apex . Otherwise , the lungs appear clear . Aside from mild - to - moderate rightward convex curvature centered along the mid thoracic spine , bony structures are unremarkable .
    OUTPUT:
    
No evidence of acute disease .