Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unchanged , with mild unfolding of the thoracic aorta again demonstrated . Pulmonary vascularity is normal . The lungs are clear . No pleural effusion or pneumothorax is identified . No acute osseous abnormality is seen . There are mild degenerative changes in thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .