Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Subtle opacity seen projecting over the right lung base which could represent a small area of atelectasis or in the right clinical setting early pneumonia . Otherwise the lungs are clear . No effusion or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Small focal opacity projecting over the right lung base could represent atelectasis versus early pneumonia .