患者女,62岁,以双下肢麻木无力10年,进行性加重3月入院。10年前无明显诱因出现双下肢无力,治疗后好转,后常有发作,病情无明显加重。近3月来双下肢麻木加重,无胸腹部、腰背部、双下肢疼痛。查体:双下肢肌力IV级,双膝关节以下痛觉减退,触觉存在,腹壁反射未引出,双膝腱反射亢进,病 Female patient, 62 years old, with weak lower limb numbness 10 years, progressive increase in March hospitalization. Ten years ago there was no obvious incentive to lower extremity weakness, improvement after treatment, often after the attack, the disease was no significant increase. Nearly three months increased numbness of lower extremities, no chest abdomen, lower back, lower extremity pain. Physical examination: Class IV lower extremity muscular strength, hypoalgesia below the knee joint, presence of tactile sensations, reflex of the abdominal wall, hyperreflexia of both knees, disease