Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs appear hyperinflated and somewhat lucent suggesting underlying emphysema . There is retrocardiac opacity which in the correct clinical setting may represent pneumonia or atelectasis . There is tiny left pleural effusion . Chain sutures in the left suprahilar region reflect prior resection . The cardiomediastinal silhouette is stable . No pneumothorax . No bony injury .
    OUTPUT:
    
Emphysema with subtle opacity in the left lower lobe possibly pneumonia or atelectasis . Postsurgical changes at the left suprahilar region .