Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Coronary artery stent is noted . The aorta is mildly tortuous . The mediastinal and hilar contours are otherwise unremarkable . The pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is present . There are mild degenerative changes noted in the thoracic spine . Chronic bilateral rib fractures are present .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Chronic bilateral rib fractures .