Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . A very subtle opacity in the right lower lung could represent atelectasis versus a very early pneumonia . Otherwise lungs appear clear . No large effusion or pneumothorax . Cardiomediastinal silhouette appears normal . Bony structures are intact .
    OUTPUT:
    
Subtle opacity in the right lower lung could represent atelectasis versus a very early pneumonia .