Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is stable marked hyperinflation of the lungs , upper lobe lucency and splaying of bronchovasculature , findings consistent with underlying known severe emphysema . No confluent opacities identified to suggest aspiration or pneumonia . There is no pneumothorax or pneumomediastinum . Minimal blunting of the right costophrenic angle is unchanged compared to prior examination and may be related to pleural thickening . There is no pleural effusion . The aortic knob remains markedly calcified . Cardiomediastinal contours are within normal limits . There is no pulmonary edema or vascular congestion .
    OUTPUT:
    
Stable severe emphysema without acute cardiopulmonary process .