Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is new opacity projecting over the spine inferiorly on the lateral view not present on prior . Elsewhere , the lungs are clear . Cardiomediastinal silhouette is within normal limits . Multiple old right - sided rib fractures are again noted .
    OUTPUT:
    
Basilar opacity on the lateral view could represent atelectasis , although infection or aspiration are possible .