Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are bibasilar opacities , left greater than . Superiorly , the lungs are clear . The cardiomediastinal silhouette is within normal limits . Old bilateral healed rib fractures are identified .
    OUTPUT:
    
Bibasilar opacities potentially atelectasis noting that infection could be considered in the proper clinical setting .