Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a subtle opacity at the right mid - to - lower lung zone , which may represent infection . There is likely atelectasis in the left lower lobe . The lungs are hyperexpanded . Severe emphysema is again noted . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is normal . The bones are intact .
    OUTPUT:
    
Subtle opacity at the right mid - to - lower lung zone may represent infection .