Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The descending aorta shows mild unfolding . The arch is again partly calcified . The mediastinal and hilar contours appear unchanged . A streaky left infrahilar opacity suggests minor atelectasis or scarring . Otherwise , the lungs appear clear . There is no evidence for pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of acute disease .