Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . Patchy right upper lobe opacities appear to have continuously decreased with slight residua suggesting scarring . Current findings are similar to earlier radiographs from ___ , suggesting stable background scarring .
    OUTPUT:
    
No evidence of acute disease .