Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The bilateral lungs appear well inflated . There is a subtle opacity in the right posterior lung base , which in the appropriate clinical setting could represent pneumonia . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are otherwise normal .
    OUTPUT:
    
Subtle opacity in the right posterior lung base could represent pneumonia in the right clinical setting .