Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is streaky density in the left upper lobe most consistent with subsegmental atelectasis or scarring . The right lung is clear . The heart is normal size . Mediastinal structures are otherwise unremarkable . There is a moderate thoracic scoliosis convex to right . The bony thorax is grossly intact .
    OUTPUT:
    
Left lung subsegmental atelectasis or scarring .