Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is normal . The mass in the superior segment of the left lower lobe seems slightly more prominent in today 's examination . No new focal consolidations . There are no pleural effusions or pneumothorax . Visualized osseous structures are grossly unremarkable .
    OUTPUT:
    
Stable left lower lobe mass , which is slightly more prominent on today 's examination .