Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperexpanded with flattening of the hemidiaphragms compatible with known emphysema . Bilateral interstitial opacities have improved since ___ . Heart size is normal . There is dilation and tortuosity of the thoracic aorta with a known saccular aneurysm of the arch . There is no large pleural effusion or pneumothorax . An abdominal aortic stent is partially visualized in the upper abdomen .
    OUTPUT:
    
1 . Interval improvement of bilateral interstitial opacities . 2 . Emphysema .