临床上确定内口的方法有:从外口的位置判断;指诊和肛镜检查;注射色素;探针检查;X 线照像等五种方法结合运用。但目前尚无一个十分理想的内口定位法。笔者体会,当遇见复杂性的肛瘘,内口不清时,不应盲目探针检查或切开,以至破坏了瘘的自然面貌,应先行触摸管道及指诊找寻内口。如无内口发现则可从外口注入色素,让其自然流散,稍加按摩挤压,使主管、支管及脓腔 Clinically determined within the mouth of the method are: judging from the position of the mouth; finger and analoscopy; injection of pigment; probe examination; X-ray combined with the use of five methods. However, there is not a very ideal internal location method. The author understands that when encountering the complexity of the anal fistula, the inner mouth is not clear, you should not blindly probe or cut open, and even destroyed the natural appearance of the fistula, should first touch the pipe and fingers to find the inner mouth. If no inner mouth can be found from the external port injection of pigment, let it flow naturally, a little massage extrusion, so that supervisor, branch and abscess