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 similar mild relative elevation of the right hemidiaphragm , compared to the left . Minimal left basilar opacity appears unchanged and suggests minor atelectasis . Otherwise , the lungs appear clear . There are no pleural effusions or pneumothorax . The bony structures are unremarkable .
    OUTPUT:
    
No evidence of acute disease .