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肛瘘(gang lou)又称肛管直肠瘘,是肛管或直肠与肛周(gang zhou)皮肤(pi fu)相通的肉芽肿性管道,主要侵犯(qin fan)肛管,很少涉及直肠,故常称为肛瘘(gang lou),内口多位于齿状线附近,外口位于肛周(gang zhou)皮肤(pi fu)处。整个瘘管壁由增厚的纤维...