Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top - normal with mild tortuosity of the thoracic aorta . Aortic knob calcifications are noted . Cardiomediastinal silhouette and hilar contours are otherwise unremarkable . Lungs are clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality .