[Problems of the diagnosis and surgical treatment of incomplete internal fistulas of the rectum].

An experience with the surgical treatment of 505 patients with incomplete fistulas of the rectum is analyzed. Preoperative methods of diagnosis are shown to be not very informative. Of determining importance for the selection of the method of surgery is the relationship of the fistula passage to the sphincter fibres. Data of the operation performed and of the nearest postoperative complications are presented.