患者,女,36岁。2个月来出现左下肢无力。查体:左侧下肢轻瘫,膝、跟腱反射增强, Babinski征阳性;右侧下肢自腹股沟以下痛觉减退。在排除椎管内病变时,不可能的病变部位是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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