Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior radiograph performed on ___ , lung volumes are lower , which accentuates bronchovascular markings . There may be a subtle opacity at the right lung base , which could represent developing pneumonia . No pleural effusions or pneumothorax . Cardiomediastinal silhouette is within normal limits . Pacer leads terminate in the right atrium and right ventricle , as expected .
    OUTPUT:
    
Subtle right lung base opacity may represent developing pneumonia .