Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . The mediastinal and hilar contours are within normal limits . Pulmonary vascularity is normal . The lungs are clear . There is hyperinflation of lungs with flattening of the diaphragms which may suggest underlying COPD . No pleural effusion or pneumothorax is present . No acute osseous abnormality is seen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .