Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The cardiomediastinal silhouette and hilar contours are unchanged . Lungs are hyperinflated . Mild bibasilar atelectasis . Lungs are otherwise clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality .