Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperexpanded , diffusely radiolucent , with well - delineated vasculature suggestive of COPD . No focal opacities are present . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of acute cardiopulmonary process . The mediastinum is not widened .