Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperexpanded , without focal opacities . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . There is no evidence of pneumomediastinum or abdominal free air . A vascular stent is noted overlying the left cardiac border , unchanged in position compared with prior exam .
    OUTPUT:
    
No evidence of acute cardiopulmonary process . No evidence of pneumoperitoneum .