Types of Anal Fistula

Why classification matters

Fistulas differ by height, branches, and sphincter involvement (commonly described using Parks classification). The same symptom — discharge — can come from a straightforward low tract or a horseshoe network. Dr. Kundan Kharde uses classification to pick laser, fistulotomy, LIFT, VAAFT, or staged seton care.

Simple (lower-risk) patterns

Often a single tract with limited sphincter involvement. Many are suitable for fistulotomy or FiLaC after consent. Success rates are generally favourable when the tract is fully identified.

Complex (higher-risk) patterns

Multiple openings, high transsphincteric extension, recurrent scarring, or active Crohn’s inflammation increase planning difficulty. MRI may be arranged to avoid missing side branches that cause recurrence. See how complex tracts are treated when a fistula is high, branched, or has already been operated.

Horseshoe fistula

A circumferential component around the anus can accompany abscess pockets. Management may combine drainage, setons, and delayed definitive repair — rarely a single short laser session.

How Dr. Kharde determines type

Office examination, proctoscopy, imaging, and occasionally exam under anaesthesia for unclear anatomy. I image almost every fistula before I operate — an MRI fistulogram or a trans-rectal ultrasound.

Treatment options by pattern

Simple: FiLaC or fistulotomy. Complex: staged plan, possible open component. Compare: laser vs open fistula surgery.

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