The patients were then classified into 2 groups. After carefully explaining the purpose of the study, an informed consent was taken from every patient. Group I: Fistulectomy, closure of internal sphincter with loose vicryl 3(0) suture and rectal advancement flap (the length 5cm of the flap is twice its width) includes mucosa, submucosa, circular muscle layer sutured 1cm below the level of internal opening. Group II: The same as group one but the flap includes only mucosa and submucosa.