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当前学科：神经系统疾病
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男性32岁，双下肢无力3个月，查体双上肢正常，又下肢肌力3级，肌张力高，跟膝腱反射亢进，病理反射（+），其病变部位可能是（）
A . 胸髓
B . 腰膨大
C . 颈膨大
D . 高颈髓
E . 脊髓前角细胞
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