Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to study of ___ there it is interval improvement in bilateral interstitial opacities . Persistent low lung volumes with bibasilar atelectasis is unchanged in appearance . Colonic interposition is noted on the right . A linear opacity in the right lower lobe is seen . Heart size , mediastinal contour and hila are within normal limits . Limited assessment of osseous structures demonstrates healed right rib fractures .
    OUTPUT:
    
1 . Low lung volumes with bibasilar atelectasis . 2 . Linear opacity in right lower lobe is most consistent with atelectasis however may represent pneumonia in the appropriate clinical setting .