Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are mildly hyperexpanded but clear . The heart is not enlarged . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . Mild pleural thickening in the lung apices is not appreciably changed .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Emphysema .