An anal fistula is an abnormal passageway formed between the anal canal and the skin surface. The anal glands & their outlets get blocked, which results in infection of surrounding area. Thus, the fistula is formed with an inflamed nature. Treatment of fistulae involves total elimination/removal of the fistula tract.

In this Core technique for fistula, excision of the tract is achieved, although there is a risk of sphincter damage. But otherwise, this is an effective and safe method, especially for complex fistulaes; and there is hardly any disturbance of continence.