Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . The aorta is mildly tortuous . Pulmonary vascularity is normal . The lungs are clear . Hilar contours are normal . No pleural effusion or pneumothorax is identified . There are mild multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .