retroperitoneal pregnancy

例句：

1. 1. The patient had a retroperitoneal pregnancy, which required immediate surgery.
   患者患有腹膜后妊娠，需要立即进行手术。
2. 2. The diagnosis of retroperitoneal pregnancy is often difficult due to its location and the lack of symptoms.
   由于其位置和缺乏症状，诊断腹膜后妊娠往往很困难。
3. 3.In cases of retroperitoneal pregnancy, early intervention can significantly reduce the risk of complications.
   在腹膜后妊娠的情况下，早期干预可以显著降低并发症的风险。