Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged but unchanged from the prior study . The cardiomediastinal and hilar contours are within normal limits and stable . There is minimal calcification of the aortic arch . The pulmonary vasculature is normal . The lungs are clear . There is no evidence of effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality .