Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lower lung volumes are seen on the current exam . Bibasilar opacities may be secondary to atelectasis . The lungs are otherwise clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities identified .
    OUTPUT:
    
Bibasilar opacities likely atelectasis given the low lung volumes noting that infection can not be entirely excluded .