肛瘘是肛管与肛门周围皮肤相通的感染性管道，其内口通常位于齿线部位，外口位于肛周皮肤上，多系肛管直肠周围脓肿自行溃破或切开引流后，脓腔缩小而形成瘘管。一般具有内口、外口，内口开口部位于齿线的肛隐窝，外口与肛门周围皮肤相通，瘘管可以穿过内、外括约肌和提肛肌向直肠、肛管...
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