Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is bibasilar subsegmental atelectasis and or scarring as before . There is no definite focal consolidation . The heart is normal in size . Mediastinal structures are otherwise unremarkable and unchanged . The bony thorax is grossly intact . Allowing for differences in technique , there is no significant change .
    OUTPUT:
    
Bibasilar subsegmental atelectasis or scarring . A small focal area of consolidation at the lung bases would be difficult to exclude . ___ , MD