Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mildly enlarged cardiac silhouette is unchanged . Persistent low lung volumes and bibasilar subsegmental atelectasis and - or scarring , unchanged since the prior study . No new focal consolidation is identified . No pneumothorax .
    OUTPUT:
    
Persistent bibasilar subsegmental atelectasis and / or scarring . No new focal consolidation .