rectal sinuses

例句：

1. 1.The patient was diagnosed with a rectal sinus infection.
   病人被诊断出患有直肠窦感染。
2. 2. The doctor performed a rectal sinus biopsy to investigate the cause of the patient's symptoms.
   医生进行了直肠窦活组织检查，以调查病人症状的原因。
3. 3. The patient required surgery to remove the rectal sinus, which had been causing significantdiscomfort.
   病人需要进行手术来移除直肠窦，该区域一直导致严重的不适。