Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate stable hyperinflation of the lungs with relative lucency of the bilateral upper lungs consistent with emphysema . No focal opacification concerning for pneumonia . Cardiomediastinal and hilar contours are unremarkable . Aortic arch vascular calcifications evident . No pleural effusion or pneumothorax identified .
    OUTPUT:
    
Stable background changes of emphysema without acute cardiopulmonary process .