■单侧双胎异位妊娠在自然妊娠中极为罕见，发病率仅为200,000-250,000人中有1人，对育龄妇女构成重大健康风险，甚至会导致危及生命的并发症.缺乏体外受精-胚胎移植（IVF-ET）周期后这种罕见疾病患病率的数据。
■我们介绍了一例51岁女性，在冷冻胚胎移植后进行双侧输卵管切除术后，出现罕见的单侧双胎异位妊娠，其次是文献综述。
■双胎异位妊娠是一种非常罕见的妊娠类型，需要高度怀疑才能及早诊断和治疗，以防止并发症和孕产妇死亡。
UNASSIGNED: Unilateral twin ectopic pregnancy is extremely rare in natural pregnancy, with an incidence rate of only 1 in 200,000-2,500,000, represents a major health risk for reproductive-aged women, leading to even life-threatening complications. There is a lack of data on the prevalence of this rare disease after in-vitro fertilization-embryo transfer (IVF-ET) cycles.
UNASSIGNED: We present a case of a 51-year-old woman with rare unilateral twin ectopic pregnancy after frozen embryo transfer treated with bilateral salpingectomy, followed by a review of the literature.
UNASSIGNED: Twin ectopic pregnancy is a very rare type of pregnancy that requires a high index of suspicion to diagnose and treat early to prevent complications and maternal death.
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