Fistulas of a rectum - patholologically formed courses in a wall of a rectum and coming to an end in a perirectal fat (incomplete internal) or more often opening on a skin around of an anus (full external).

Pathogenesis. After spontaneous or surgical opening a paraproctitis the report with a lumen of a rectum is kept owing to a constant becoming infected and formation of the cicatrical changed tissues around of an aperture in a mucosa of a rectum (in a zone of a crypta).

Signs, current. At full external fistulas on a skin around of an anus or on breeches find out one or several punctual apertures with inspissation of tissues around and constant or periodic unit of slime or pus and a maceration of a surrounding skin.