Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . There is a streaky right lower lung opacification , probably in the right lower lobe , but similar to earlier examinations and suggestive of minor atelectasis or scarring . Otherwise , the lungs appear clear . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
No evidence of acute disease .