Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . Heterogeneous lung architecture suggests emphysema including relative lucency in the left upper lung compared to the right . There is no pleural effusion or pneumothorax . There is no free air .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease . Suspected emphysema .