Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . The heart is not enlarged . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . A saccular aneursym of the aortic arch is calcified . There are healed right rib fractures . Elevation of the right hemidiaphragm is mild .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Calcified saccular aneursym of the aortic arch is better characterized on concurrent CT of the chest .