Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded with a subtle left lower lobe opacity . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal . No pleural effusion or pneumothorax is present . Note is made of several clips in the left upper quadrant .
    OUTPUT:
    
Left lower lobe opacity could represent atelectasis or pneumonia in the appropriate clinical setting .