Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal with mild tortuosity of the thoracic aorta . Slight indentation of the cervical trachea is suggestive of enlarged thyroid , which has been previously evaluated by ultrasound . Hilar contours are unremarkable . Lungs are clear . Nipple shadows should not be confused for nodules . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality .