患儿女,6岁。主因坐、站、行走不稳2d,于2002年8月住院。入院前7d患儿下唇邻近口周皮肤痒痛、色红,随即出现成簇密集分布小米粒大小透明水泡,无发热,当地医院诊断为单纯疱疹,未予治疗,疱疹很快破溃,形成表浅溃疡井结痂。入院前5d,患儿开始坐、站、行走不稳,容易跌倒,无头痛、呕吐,无惊厥及昏迷,无发热。入院查体:体温 Children with children, 6 years old. The main reason for sitting, standing, walking unstable 2d, in August 2002 hospitalization. 7d before admission to the lower lip of the child near the perioral skin itch pain, color red, followed by clusters of densely distributed size of transparent millet bubble, no fever, the local hospital was diagnosed as herpes simplex, untreated, herpes quickly rupture, the formation of Superficial ulcer wells scab. 5d before admission, children began to sit, stand, walking unstable, easy to fall, no headache, vomiting, no convulsions and coma, no fever. Admission examination: body temperature