rectoscopy

例句：

1. 1.The patient underwent a rectoscopy to examine the colon for any abnormalities.
   患者接受了一次直肠镜检查，以检查结肠是否有异常。
2. 2. The doctor recommended that the patient undergo a rectoscopy to rule out any potential cancer.
   医生建议患者接受直肠镜检查，以排除任何潜在的癌症。
3. 3. During the procedure, the doctor inserted a flexible endoscope into the patient's rectum to perform the rectoscopy.
   在手术过程中，医生将一根灵活的内窥镜插入患者的直肠进行直肠镜检查。