Objective:To investigate the characteristics and diagnostic value of MRI for twin reverse arterial perfusion (TRAP)syndrome.Methods:A retrospective study was performed in 83 pregnant women with various fetal malformations. Single-shot fast spin-echo T2-weighted sequences (SSFSE),thick-slab heavy T2 WI with SSFSE and three-dimensional fast imaging employing steady state acquisition were performed.Among the 83 cases,TRAP were confirmed in 4 cases by autop-sy after induced abortion and follow-up records.The MRI images,clinical data and pregnancy outcomes were all analyzed, and MRI characteristics of the TRAP were summarized.Results:4 cases with TRAP were initially diagnosed during 12~31 weeks'gestation.Each acardiac recipient twin of the 4 cases had none or abnormal heart,with various severe malformations. One of 4 cases was born prematurely at 28 weeks and 5 days'gestation and the twins both died.Induced labor was performed in 2 cases.The acardiac recipient twin in one case was detected as stillbirth by ultrasound examination at 24 week'gestation and this case was delivered at 37 weeks'gestation with the pump twin delivered alive.Conclusion:MRI as a complementary method of ultrasound has great applicative value for TRAP syndrome in early diagnosis,prognosis assessment,decisions of optimal treatment and selection of deliver time.%目的：探讨双胎反向动脉灌注序列征（TRAP）的 MRI表现及其诊断价值。方法：回顾性分析本院83例不同的胎儿畸形的 MRI资料，MRI扫描均采集单次激发快速自旋回波序列（SSFSE）、厚层重T2加权成像 SSFSE 序列、三维稳态进动快速成像（3D-FIESTA）序列，其中胎儿引产尸检及随访证实其中的TRAP有4例。分析其 MRI图像、临床资料及妊娠结局，总结TRAP的 MRI影像学特征。结果：4例TRAP 初次确诊的孕周为12～31周。4例TRAP 中每例无心胎儿均缺乏或无正常的心脏，且伴发各种不同的严重畸形。4例TRAP中1例于孕28周5天早产，双胎死亡；2例引产；1例无心胎儿于孕24周超声检查时发现无心胎儿死胎，继续妊娠至37周剖腹产分娩，泵血胎儿结局良好。结论：产前 MRI检查对于TRAP的早期诊断、预后判断、治疗方案及分娩时机的选择都有着重要的应用价值，MRI 是超声外对TRAP 的重要补充检查方法。
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