Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is of normal size with normal cardiomediastinal contours . Linear opacities in the lung bases are compatible with plate - like atelectasis . No pleural effusion or pneumothorax . No radiopaque foreign body . Osseous structures are unremarkable .
    OUTPUT:
    
Bibasilar atelectasis . No pneumothorax .