Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Subtle opacity projecting over the left lung base is concerning for an early pneumonia . Otherwise the lungs are clear . No effusion or pneumothorax . Cardiomediastinal silhouette appears normal . Bony structures are intact .
    OUTPUT:
    
Subtle opacity at the left lung base is concerning for early pneumonia .