Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Cardiomediastinal contours are within normal limits . Persistent linear bibasilar atelectasis . Slightly more confluent opacity projects posteriorly over the spine on the lateral view , obscuring the posterior hemidiaphragms bilaterally , likely corresponding to patchy areas of increased opacity in the retrocardiac area on the frontal view . There are no pleural effusions . Rounded opacity in the right upper quadrant of the abdomen corresponds to post - TACE changes .
    OUTPUT:
    
Bibasilar opacities , most likely due to atelectasis , but coexisting aspiration or pneumonia can not be excluded in the dependent portions of both lower lobes .