retropyloric lymph nodes

例句：

1. 1. The doctor performed a biopsy on the patient's retropyloric lymph nodes to investigate the cause of his symptoms.
   医生对患者的回肠淋巴结进行了活检，以调查他症状的原因。
2. 2. The patient's condition worsened after the surgery, and the doctors had to perform a second operation on his retropyloric lymph nodes.
   手术后，患者的病情恶化了，医生不得不对他的回肠淋巴结进行第二次手术。
3. 3. Due to the presence of retropyloric lymph nodes, the patient required additional tests to rule out any infection or inflammation.
   由于存在回肠淋巴结，患者需要进行额外的测试，以排除任何感染或炎症。