Clinical features: Clinical symptoms manifest as progressive bottom-up sensory deficits below the level of the thoracolumbar segment at 6 months to 2 years of disease onset, with paraplegia usually occurring in 2 to 4 years. The beginning of the disease is often characterized by a single sensory, motor or sphincter dysfunction, such as asymmetric burning sensation or ant walking sensation in both lower limbs, intermittent claudication, and so on. Some of these patients start with difficulty in urinating and are diagnosed with prostatic hypertrophy and undergo prostatectomy. According to the way the disease progresses, it can be divided into three forms: 1. acute onset and gradual aggravation; 2. acute onset with remission of symptoms; 3. later on, sudden aggravation of the bimodal type; slow progressive aggravation; All the intervertebral foramina are widely opened during the operation to fully expose the nerve roots. Blood-supplying arteries and draining veins through the dura mater, in the draining veins through the dura mater and the expansion of the coronary venous plexus between the cauterization cut off, and then cauterized to clear the fistula that is to say, the draining veins become purple, the pressure is reduced. Microsurgical resection of the lesion was successful.