Howeverwith MRI scanning 9 cases had abnormal signal change in medulla oblongata, 5 cases had abnormal signal change incerebellum, 2 cases had abnormal signal in basal ganglion.

• 发病72h内头部MRI检查，9例延髓有异常信号改变，5例小脑有异常信号改变，2例基底节区有异常信号改变。