<num>. interval removal of et and ng tubes. <num>. the superior mediastinum is slightly more prominent, but this may be accounted for by patient rotation. attention to this area on followup films is requested. <num>. patchy bibasilar opacities, probably slightly worse in the retrocardiac region. while this may represent atelectasis, the differential diagnosis, particularly at the left base, includes an early pneumonic infiltrate. changes of aspiration pneumonitis are also in the differential. <num>. upper zone redistribution, without overt chf, similar to the prior film.