retroperistalsis

例句：

1. 1. The patient had a retroperitoneal hemorrhage, which required immediate surgical intervention.
   患者出现了腹膜后出血，需要立即进行手术干预。
2. 2.The doctor diagnosed the patient with a retroperitoneal mass and advised further testing.
   医生诊断出患者患有腹膜后肿瘤，并建议进一步检查。
3. 3.The patient's symptoms worsened after the surgery, prompting further investigation into the cause of the retroperitoneal hemorrhage.
   手术后，患者的病情恶化，进一步调查了腹膜后出血的原因。