Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Subtle opacities in lower lungs likely represent atelectasis . An early pneumonia difficult to exclude . No large effusion or pneumothorax . Cardiomediastinal silhouette is normal .
    OUTPUT:
    
Subtle opacities in lower lungs , most compatible with atelectasis , though an early pneumonia not excluded .