患者　女 ,5岁。无诱因出现双下肢软瘫 5天。查体 :未引出病理反射。ＣＴ检查 :见第 4腰椎右侧关节突向椎管内突出的骨性高密度 ,皮质与正常皮质相延续 ,基底稍细 ,端部呈杵状 ,脊髓受压向左移位 (附图 )。ＣＴ诊断 :第 4腰椎右侧关节突畸形发育。手术所见 :第 4腰椎右侧关节突 Female patient, 5 years old. No incentive to appear double lower limbs paralysis 5 days. Physical examination: did not lead to pathological reflex. CT examination: see the 4th lumbar facet joint protruding to the vertebral canal high bone mineral density, cortical and normal cortical phase extension, the base is thinner, the tip was clubbed, spinal cord pressure shift to the left (with photos) . CT diagnosis: fourth lumbar facet deformity development. Surgical findings: 4th lumbar right articular process