carcinoma of sigmoid

例句：

1. 1.
   医学
2. 2.
   解剖学
3. 3.
   建筑学
4. 1. The patient's condition was diagnosed as a carcinoma of the sigmoid.
   患者的病情被诊断为乙状结肠的癌症。
5. 2. During surgery, the surgeon removed a tumor from the sigmoid.
   在手术中，外科医生从乙状结肠切除了一个肿瘤。
6. 3. The patient underwent a colonoscopy to investigate the sigmoid region.
   患者接受了结肠镜检查，以调查乙状结肠区域。