Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A Portable view of the chest demonstrates low lung volumes . Bibasilar opacities symmetrically are consistent with atelectasis . There is no pleural effusion or pneumothorax . The cardiomediastinal contour is unchanged . Known bilateral rib fractures are better seen on concurrent CT of the torso .
    OUTPUT:
    
Bibasilar symmetric opacities are consistent with atelectasis . No pleural effusion or pneumothorax .