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 a band - like opacity suggesting atelectasis or scarring in the left lower lobe . Elsewhere , the lungs appear clear . There are no pleural effusions or pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Band - like opacity suggesting atelectasis or scarring ; otherwise unremarkable .