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经直肠B超扫描（TRU）能对直肠癌进行分期，其正确率超过70％，作者使用TRUS以选择下2／3直肠绒毛状肿瘤的手术步骤。采用AlokaSSA－520超声仪，探头7.5MHz，能作360°扫描。共检查24例。（一）手术步骤经肛管局部切除适用于位于肝缘上方2～5cm的1～5cm大小肿瘤，经括约肌次肠
Transrectal ultrasonography (TRU) can stage rectal cancer with a correct rate of more than 70%. The authors used TRUS to select the next 2/3 rectal villous tumors. Using AlokaSSA-520 ultrasound system, the probe is 7.5MHz and can scan 360°. A total of 24 cases were examined. (A) surgical procedures for local anal resection of the anal canal is suitable for 1 ~ 5cm tumor located 2~5cm above the liver margin, the sphincter subintestinal