Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are normal . There is a vague opacity in the right lower lobe which could reflect atelectasis or pneumonia , depending on the clinical setting . No pleural effusion or pneumothorax . The heart is normal size . The mediastinal and hilar structures are unremarkable . Cholecystectomy clips are noted .
    OUTPUT:
    
Vague right lower lobe opacity could reflect increased atelectasis or pneumonia in the correct clinical setting .