Anal Fistula · Fistulotomy vs Sphincter-Sparing Procedure

Step-by-step decision

Choose step by step as prompted; reaching an endpoint gives the management recommendation. You can go back a step or restart anytime.

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Full pathway

1. [Decision] Complexity (sphincter volume) + abscess/Crohn
   Sphincter volume involved? Acute abscess? Crohn's?
   • Acute perianal abscess → Abscess → incision and drainage
   • Simple low (subcutaneous/low transsphincteric, little sphincter involved) → Simple low → fistulotomy
   • Complex high (high transsphincteric/suprasphincteric, anterior in women, multiple) → Complex high → sphincter-sparing procedure
   • Crohn's disease-related → Crohn's fistula → seton + biologics
2. [End] Abscess → incision and drainage
   Perianal abscess → prompt incision and drainage (do not blindly lay open the fistula tract primarily); later assess for fistula formation and manage.
3. [End] Simple low → fistulotomy
   Simple low fistula → fistulotomy (high cure rate); little sphincter involved, low incontinence risk.
4. [End] Complex high → sphincter-sparing procedure
   Complex high fistula → sphincter-sparing procedure: seton (draining/cutting), LIFT, advancement flap; staged management, balancing recurrence rate against incontinence risk.
5. [End] Crohn's fistula → seton + biologics
   Crohn's-related anal fistula → draining seton + control intestinal inflammation (biologics such as anti-TNF); avoid aggressive lay-open causing incontinence; multidisciplinary.

Source guidelines & references

• Perianal abscess and anal fistula management (ASCRS clinical practice guideline)

This pathway is our own synthesis of the decision logic in the guidelines above (not the guideline verbatim); thresholds and workflows change as guidelines update — in practice follow the latest guideline, your institution's protocol and the individual patient.

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