Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest film ___ at 10 :49 is submitted .
    OUTPUT:
    
Lung volumes remain markedly diminished but overall , there does not appear to be any significant interval change . There are stable patchy bibasilar opacities most likely reflecting atelectasis , although aspiration or pneumonia can not be entirely excluded . No definite new airspace consolidation is appreciated . The heart remains enlarged . There continues to be prominent colonic distention . Interval placement of a nasogastric tube which is seen coursing below the diaphragm but the tip is not identified .