Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are bibasilar opacities which could be due to atelectasis given low lung volumes . Elsewhere , the lungs are clear . The cardiomediastinal silhouette is stable . No displaced acute fractures identified . Old anterolateral left rib fractures are noted .
    OUTPUT:
    
Bibasilar opacities are most likely atelectasis .