Fistulotomy: a brief explanation

  
1. A probe is inserted, and the surgeon will cut open along the entire length of the fistula, from the internal opening to the external opening.

2. The surgeon will then flush out the contents of the now-open tract, and flatten it out.

3. Finally, the surgeon will sew the skin edges of the tract to keep it flat, and ideally the fistula will heal over the course of a month or two into a flat scar.