Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vascularity is not engorged . Linear opacities within the lung bases persist , and may reflect a combination of scarring with atelectasis . No focal consolidation , pleural effusion or pneumothorax is visualized . There are no acute osseous abnormalities .
    OUTPUT:
    
Bibasilar linear opacities likely representing combination of atelectasis with scarring .