Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The mediastinal and hilar contours are unchanged . Lungs are hyperinflated with biapical scarring re - demonstrated . Minimal streaky opacities seen within the lung bases , findings which could reflect atelectasis , but infection is not excluded in the correct clinical setting . No pleural effusion or pneumothorax is otherwise noted . There are no acute osseous abnormalities .
    OUTPUT:
    
Streaky bibasilar airspace opacities may reflect atelectasis but infection is not excluded in the correct clinical setting .