Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is severe emphysema with unchanged areas of scarring in the right lower lobe . The chest is hyperinflated . The upper part of an aortic stent graft is partly visualized . There is no evidence of superimposed acute process . There has been no significant change .
    OUTPUT:
    
Severe emphysema . No evidence of acute cardiopulmonary disease .