Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are very low likely due to severe abdominal distention from dilated large bowel . There are bibasilar opacities , which likely represents atelectasis ; however , pneumonia can not be ruled out . The patient has tracheostomy in appropriate position . No evidence of pneumothorax . No large pleural effusion identified . Please see dedicated abdominal films for better characterization of the abdominal findings .
    OUTPUT:
    
1 . Very low lung volumes , likely given distention of abdomen . This is causing bibasilar atelectasis , however , pneumonia or aspiration can not be ruled out given the basilar opacities . No free air identified .