患儿,女,9岁。于入院前20d无任何诱因出现阵发性头痛,严重时出现喷射状呕吐,伴复视及视力锐减。起初仅视物不清晰,继而无法识字,入院前4d双目完全失明。病后无发热,无多饮、多尿现象。查体:神清,营养发育正常,双瞳孔散大约0.8cm,无光感,眼球活动自如。四肢运动、感觉正常,无病 Children, female, 9 years old. 20d before admission without any incentive to paroxysmal headache, severe jet-like vomiting, with diplopia and sharp vision loss. At first glance only visual ill-defined, and then unable to literacy, 4d before admission blindness completely. No fever after the illness, no drink, polyuria phenomenon. Physical examination: God clear, normal nutrition and development, double pupil scattered about 0.8cm, no light feeling, eye movement freely. Extremities exercise, feeling normal, disease-free