Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low , resulting and accentuation of the cardiomediastinal contours and crowding of bronchovascular structures at the lung bases . Within this context , predominantly linear bibasilar opacities probably reflect atelectasis . The previously demonstrated left lower lobe opacity has decreased in extent on the lateral view . No pleural effusion .
    OUTPUT:
    
Limited assessment due to low lung volumes . Probable bibasilar atelectasis .