Abstract：
Conjoined twins represent a rare type of monoamniotic twins. Ultrasound assessment during the first trimester can facilitate the diagnosis, however further assessment by colour Doppler studies, 3D imaging, fetal echocardiography and fetal magnetic resonance imaging (MRI) is usually required in order to determine the specific fetal abnormalities and to guide appropriate pregnancy management. This case report presents a rare case of conjoined twins complicating a dichorionic-diamniotic triplet pregnancy, achieved after intracytoplasmic sperm injection (ICSI) and blastocyst transfer. A 44-year-old woman was referred for chorionicity determination to our Fetal Medicine Centre due to suspicion of conjoined twins in a triplet pregnancy. Ultrasound assessment at 11 weeks demonstrated a dichorionic triplet pregnancy which was also complicated by a rare type of conjoined twins (thoracoomphalopagus) and after a successful embryo reduction a neonate of 2200 g was delivered by caesarean section at term. The accurate diagnosis and early detection of conjoined twins by a fetal medicine specialist is crucial, especially as far as multiple pregnancies with three or more fetuses are concerned.
摘要：
连体双胞胎代表一种罕见的单羊膜双胞胎。妊娠早期的超声评估可以促进诊断，然而，通过彩色多普勒研究进一步评估，3D成像,通常需要胎儿超声心动图和胎儿磁共振成像(MRI)来确定特定的胎儿异常并指导适当的妊娠管理.此病例报告介绍了一例罕见的连体双胞胎，并发二胎-羊膜三胎妊娠。在胞浆内单精子注射（ICSI）和囊胚移植后实现。一名44岁的妇女因怀疑三胞胎中的连体双胞胎而被转介给我们的胎儿医学中心进行绒毛膜检查。11周时的超声评估表明，双胎三胎妊娠也因罕见的连体双胞胎（胸骨）而变得复杂，成功减少胚胎后，足月通过剖腹产分娩了2200g的新生儿。胎儿医学专家对连体双胞胎的准确诊断和早期发现至关重要，特别是对于有三个或三个以上胎儿的多胎妊娠。
