患儿,男,4岁。以突发左侧肢体抽搐、双下肢无力5个月为诉于1998年12月28日入院。入院前5个月突发左侧肢体抽搐,双眼上吊,口吐白沫,口唇青紫,持续1～2分钟后发作停止。此后逐渐出现双下肢无力,呈进行性加重,步行不稳,易倾跌,上楼登梯困难。患儿为第一胎足月顺产,发育正常,家族中 Children, male, 4 years old. To sudden left limb twitching, weakness in both lower extremities 5 months on December 28, 1998 admission. 5 months before admission, sudden left limb twitching, eyes hanging, foaming at the mouth, blue lips, sustained 1 to 2 minutes after the onset of seizures. Since then there gradually appear weakness of both lower extremities, was progressive increase, unstable walking, easy to dip, climbing stairs difficult. Children with full-term first-term fetus, normal development, in the family