Group (I) underwent modified LIFT
fistula, Fistula tract
The patient was operated in lithotomy position under spinal anesthesia. The internal opening of the fistula within the anal lumen was visualized using a probe introduced through the external opening. The fistula lumen was rinsed with hydrogen peroxide solution. An encircling incision was made around the external fistula opening, and dissection was started from the external opening, along the fistula tract, toward the internal opening as in Fig. 
Shows an encircling incision around the external fistula along the fistula tract toward the internal opening
Shows the dissection until the inner layer of the external sphincter separated from the fistula tract
Fistula tract was then ligated with Vicryl 3 − 0 at penetration of the tract in the internal sphincter
Approximation of the external sphincter edges by PDS 3 − 0