Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable supine chest radiograph was obtained . The lungs are well expanded and clear . There is no focal consolidation , effusion or pneumothorax . Marked tortuosity of the aortic arch is unchanged . There are no new abnormal cardiac and mediastinal contours .
    OUTPUT:
    
No acute cardiopulmonary process .