Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Severe hyperinflation due to bullous emphysema is stable from multiple prior studies . There is no focal consolidation , pleural effusion , pulmonary , or pneumothorax . The cardiomediastinal contour is stable . Osseous structures and the upper abdomen are unremarkable .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Severe bullous emphysema is chronic .