Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . There are linear streaky opacities at the lung bases bilaterally , which likely represent atelectasis or scarring . Cardiomediastinal and hilar contours are unchanged . There is no large pleural effusion or pneumothorax . Visualized osseous structures are unremarkable .
    OUTPUT:
    
Bibasilar linear opacities , likely represent atelectasis versus scarring .