Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Subtle lower lung opacities are suggested in the left lung base on the lateral view which could represent a very early pneumonia . Otherwise the lungs are clear . No effusion or pneumothorax . Cardiomediastinal silhouette is stable . Bony structures are intact .
    OUTPUT:
    
Subtle opacity in the left lower lobe could represent a very early pneumonia .