Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A nasogastric tube with radio -opaque tip projects over the left upper quadrant as before . Lung volumes are slightly lower than on the prior comparison examination . The cardiomediastinal and hilar contours are probably similar given differences in technique . The heart is normal in size . Bibasilar opacities and opacity in the right upper lobe are demonstrated . This could represent early asymmetric CHF . An early pneumonic infiltrate can not be entirely excluded . No frank consolidation is seen . There is no pneumothorax or gross pleural effusion .
    OUTPUT:
    
Lower lung volumes when compared to the most recent prior examination . Bibasilar opacities could represent atelectasis , infection or mild asymmetric edema . s