Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes with resulting bronchovascular crowding . There are persistent opacities in the bilateral bases , most likely atelectasis , but aspiration or pneumonia can not be excluded . There has been interval improvement in the degree of interstitial pulmonary edema , which is now almost completely resolved . Moderate cardiomegaly is unchanged . The superior mediastinum remains enlarged , likely secondary to tortuous vessels . Tracheostomy tube ends 4 .3 cm from the carina . Note is made of multiple very dilated loops of bowel in the upper abdomen .
    OUTPUT:
    
1 . Persistent opacities in the bilateral bases , most likely atelectasis , but aspiration or pneumonia can not be excluded . 2 . Note is made of multiple very dilated loops of bowel in the upper abdomen .