宫内宫外复合妊娠(heterotopic pregnancy,HP)是指2个或多个胚胎在生殖系内的不同部位同时发育,其中至少有一个属于宫内正常妊娠,其余为异位妊娠。自然状态下复合妊娠十分罕见,发生率为1/7000～1/30 000[1]。近年来,由于辅助生育技术的应用,国内外多个生殖医学中心均有关于体外受精-胚胎移植(IVF-ET)周期后发生HP的报道,发生率 Intrauterine heterotopic pregnancy (heterotopic pregnancy, HP) is the simultaneous development of two or more embryos in different parts of the reproductive system, at least one of which belongs to intrauterine normal pregnancy, the rest of the ectopic pregnancy. Complex pregnancy under natural conditions is very rare, the incidence of 1/7000 ~ 1/30 000 [1]. In recent years, due to the application of assisted reproductive technology, multiple reproductive medical centers both at home and abroad have reported the occurrence of HP after the cycle of in vitro fertilization-embryo transfer (IVF-ET), the incidence