Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are unchanged , with the heart size within normal limits . The aorta is mildly tortuous . Pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is present . Numerous chronic bilateral rib fractures are noted . No acute osseous abnormalities are seen .
    OUTPUT:
    
No acute cardiopulmonary process . Multiple old bilateral rib fractures .