Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Well - expanded lungs remain grossly clear with no focal opacities concerning for pneumonia . There are no pleural effusions or pneumothorax . The cardiomediastinal and hilar contours are stable , demonstrating mild tortuosity of the thoracic aorta . Pulmonary vascularity has not increased . There are mild degenerative changes of thoracolumbar spine .
    OUTPUT:
    
No acute cardiopulmonary process .