Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged but unchanged . The aorta is tortuous . Mediastinal and hilar contours are otherwise unremarkable . Lungs are clear . Pulmonary vasculature is normal . No pleural effusion or pneumothorax is demonstrated . Anterior osteophytes are seen in the lower thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .