Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Bronchovascular markings are prominent . Streaky density at the lung bases is consistent with subsegmental atelectasis as before . The cardiac silhouette is prominent but may be exaggerated by technical factors . Mediastinal structures are otherwise unremarkable . The bony thorax is grossly intact .
    OUTPUT:
    
Bibasilar subsegmental atelectasis . No acute change .