Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Low lung volumes noted . There is mild right basal opacity which is most suggestive of atelectasis though difficult to exclude an early pneumonia . Left lung is clear . No large effusion or pneumothorax . No signs of congestion or edema . Cardiomediastinal silhouette is unchanged . Bony structures are intact .
    OUTPUT:
    
Subtle right basal opacity likely atelectasis though difficult to exclude an early pneumonia .