双胎妊娠属于高危妊娠,随着辅助生殖技术的发展,其发生率较既往有了很大的上升(1.1%~1.2%)。不同绒毛膜性的双胎妊娠的围产结局不同。单绒毛膜(MC)双胎占双胎妊娠的20%~30%,围产期发病率及死亡率为双绒毛膜双胎的2倍。胎盘共享和普遍存在的胎盘吻合血管给单绒毛膜双胎带来了特殊挑战,可能发生双胎输血综合征 Twin pregnancies are high-risk pregnancies. With the development of assisted reproductive technology, the incidence has been greatly increased (1.1% -1.2%). Different chorionic twin pregnancies have different perinatal outcomes. Single chorionic (MC) twins accounted for 20% to 30% of twin pregnancies, with a perinatal morbidity and mortality of twice that of twin chorionic twins. Placental sharing and ubiquitous placental anastomosis vessels pose a particular challenge to monochorionic twins that may result in twin fetal transfusion syndrome