Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: New linear opacities are identified at the lung bases which may reflect subsegmental atelectasis . The remainder of the lungs appear clear . No definite large effusion is identified . There is no overt pulmonary edema . There is no pneumothorax . Cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Bibasilar atelectasis . No definite pneumonia or edema .