Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . There is mild unfolding of the thoracic aorta . Cardiomediastinal silhouette and hilar contours are otherwise unremarkable . There is mild bibasilar atelectasis . Lungs are otherwise clear . Pleural surfaces are clear without effusion or pneumothorax . Focus of air seen under the right hemidiaphragm , likely represents colonic interposition .
    OUTPUT:
    
No acute cardiopulmonary abnormality .