目的 前瞻性地探讨和比较超声（US）和磁共振成像（MRI）在胎儿蛛网膜囊肿产前诊断中的应用价值。方法 对17例产前超声检查怀疑单纯性蛛网膜囊肿的胎儿中枢神经系统(CNS)进行US和MRI检查，16例胎儿随访至生后1年或引产病检证实，失访1例；将16例胎儿两种检查的结果与随访结果进行对比分析。结果 在产前CNS超声检查怀疑蛛网膜囊肿的16例胎儿中，MRI诊断胎儿正常5例，胎儿均足月生产无特殊；MRI明确诊断胎儿蛛网膜囊肿10例，修正诊断1例，均行引产且胎儿尸检结果均证实异常。在胎儿蛛网膜囊肿检查中：超声诊断正确率62.5%，错误率37.5%；磁共振成像检查与最终结果均符合，诊断正确率100%。结论 超声是产前胎儿中枢神经系统检查的首选，但诊断效力有限，MRI是重要的补充；当超声检查怀疑胎儿蛛网膜囊肿时，需进行MRI检查进一步确诊或修正诊断。
Objective To evaluate the accuracy of Ultrasonography (US) and Magnetic Resonance Imaging(MRI) in fetal intracranial arachnoid cyst. Methods Seventeen fetuses suspected suffering from intracranial arachnoid cyst underwent US and MRI. Sixteen cases were followed up until birth or confirmed by pathology after induction of labor.The results of US and MRI were compared with the final outcomes. Results In sixteen cases suspected suffering from intracranial arachnoid cyst, five cases were comfirmed normal in MRI and these fetuses were born in full-term without anything abnormal ; ten cases were comfirmed by MRI and one cases had corrected diagnosis. Fetal autopsy confirmed their abnormals. Diagnostic accuracy rate of US was 62.5%, error rate was 37.5%; Diagnostic accuracy rate of MRI was 100%. Conclusion US is the first choice in examination of fetal CNS,but its diagnostic efficacy was limited. MRI which with high diagnostic accuracy is an important supplement. When prenatal US examination suspected IAC,fetus should be conformed by MRI.
