患者男，６４岁。２０多年前出现左下肢麻木，右下肢力弱；症状缓慢进展，能坚持工作。近５年症状加重，胸部出现束带感，双腿麻木无力，下肢僵硬，双足有踩棉感，并尿急、尿频。近１年来需扶持行动，生活不能自理。颅神经、双上肢及脊柱正常。双下肢呈痉摩性截瘫。双侧巴... Male patient, 64 years old. Left lower extremity numbness occurred more than 20 years ago, and the right lower extremity was weak; symptoms slowly progressed and work could be sustained. Symptoms have worsened in the last 5 years, with a sensation of banding in the chest, weakness in numbness of the legs, stiffness in the lower limbs, a feeling of stepping on the feet in the feet, and urgency and urinary frequency. In the past one year, it is necessary to support actions and life cannot be taken care of. The cranial nerves, double upper limbs, and spine are normal. Both lower limbs were kneeling paraplegia. Bilateral bar...