Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Overall , there has been little change from the radiograph of earlier the same day . Bibasilar opacities appear similar , likely representing atelectasis , although short interval stability does not exclude an infectious process . No frank consolidation is seen . There is probably a trace right pleural effusion . There is no pneumothorax or pulmonary edema . The cardiomediastinal silhouette is within normal limits . Density projecting over the left upper lobe is consistent with a granuloma .
    OUTPUT:
    
Short interval stability of bibasilar opacities , which likely represent atelectasis , however aspiration or pneumonia can not be excluded .