Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta is mildly tortuous . Mediastinal and hilar contours are normal and the lungs are clear . Pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . There are mild multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .