丁×，男，7岁。因服肠虫清后视力下降5天，于1994年1月16日入院。2周前，患儿因腹痛在当地村卫生室诊治，疑为肠内蛔虫感染，给予肠虫清口服，1次／日，2片／次，连服3日共6片。服药后2天，家长发现患儿食欲下降，并出现低热，1周后发现患儿视物不清，行走有困难而急入我院治 Ding ×, male, 7 years old. Serve after intestinal worms clear eyesight decreased 5 days, January 16, 1994 admission. 2 weeks ago, due to abdominal pain in children diagnosed and treated in the local village clinics, suspected intestinal intestinal roundworm infection, give oral worming oral, 1 / day, 2 tablets / time, and even served a total of 6 on the 3rd. Two days after taking the medication, parents found that children with appetite decline, and fever, one week after the discovery of children as ill-defined, walking difficulties and acute into our hospital