Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest . Again seen are linear bibasilar opacities , not definitely progressed since prior . Superiorly the lungs are clear . The cardiomediastinal silhouette is stable . Vertebroplasty changes again seen in the thoracic spine .
    OUTPUT:
    
Persistent bibasilar opacities which could be due to atelectasis or scarring given stability over time . Superimposed infection is not completely excluded .