Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Streaky bibasilar density consistent with subsegmental atelectasis or scarring persists . The lungs are otherwise clear . The heart is normal in size . Mediastinal structures are otherwise unremarkable . The bony thorax is grossly intact . There is no significant change .
    OUTPUT:
    
Bibasilar subsegmental atelectasis and or scarring .