Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are unchanged with tortuosity of the thoracic aorta again noted . Pulmonary vascularity is normal . Lungs are clear . No pleural effusion or pneumothorax is present . There are multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .