Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal with mild tortuosity of the thoracic aorta , unchanged . Hilar contours are unremarkable . There is a trace right base atelectasis . Lungs are otherwise clear . Pleural surfaces are clear without effusion or pneumothorax . There is no evidence of pneumoperitoneum . Probable posttraumatic chronic changes of the left scapula .
    OUTPUT:
    
No acute cardiopulmonary abnormality .