<正>患儿男,4岁,间断腹痛1周,无恶心、呕吐、腹泻等症状;既往体健。查体:中腹部轻压痛,背部T10~L2脊柱棘突处压痛。实验室检查:癌胚抗原0.66 ng/ml,甲胎蛋白(alphafetoprotein, AFP)12 175.00 ng/ml,糖类抗原-12514.21U/ml,糖类抗原-199 16.06U/ml。脊柱MRI:T10~L2水平椎管右侧见内外交通性占位,最大径约3.6cm,边界清,