Can a rectovaginal fistula occur after a Bartholin cyst marsupialization, and what does its presence indicate?

Rectovaginal Fistula After Bartholin Cyst Marsupialization

While extremely rare, a rectovaginal fistula can occur after Bartholin cyst marsupialization, and its presence suggests either iatrogenic injury during the procedure, unrecognized deep infection extending to the rectum, or underlying inflammatory bowel disease (particularly Crohn's disease).

Understanding the Mechanism

The development of a rectovaginal fistula following Bartholin gland procedures is exceptionally uncommon but documented in the literature. When this occurs, it typically indicates one of three scenarios:

Primary Causes to Consider:

1. Iatrogenic Injury (Most Likely)

• Direct surgical trauma to the rectal wall during marsupialization
• Occurs when the procedure is performed too deeply or posteriorly
• The anatomic proximity of Bartholin's gland to the anal canal makes this possible, particularly with high trans-sphincteric or suprasphincteric extension 1, 2

2. Deep Abscess Extension

• Pre-existing infection that had already tracked toward the rectum before surgery
• The marsupialization may have simply revealed an existing recto-Bartholin communication 3, 2
• Recurrent Bartholin abscesses increase this risk significantly 1, 4

3. Underlying Inflammatory Bowel Disease

• Critical consideration: 64% of ano-Bartholin fistulas occur in patients with inflammatory bowel disease (5 with Crohn's disease, 2 with ulcerative colitis out of 11 cases) 5
• This represents a manifestation of perianal Crohn's disease rather than a surgical complication
• Should be strongly suspected if the patient has gastrointestinal symptoms, prior IBD diagnosis, or recurrent perianal infections

Clinical Presentation

Patients typically present with:

• Passage of flatus or feces through the vagina
• Purulent or foul-smelling vaginal discharge 6
• Recurrent vaginal infections
• Dyspareunia and perineal pain 6
• Important: Symptoms may be confused with fecal incontinence 6

Diagnostic Approach

When rectovaginal fistula is suspected after Bartholin surgery:

1. Immediate workup for IBD - Given the high association (64% of cases), obtain:

   • Detailed gastrointestinal history
   • Colonoscopy if any suggestive symptoms
   • Consider inflammatory markers (CRP, ESR)

2. Imaging to define anatomy:

   • MRI pelvis is preferred for complex fistulae, showing higher accuracy than endoanal ultrasound for secondary extensions 6
   • CT pelvis with IV contrast can identify the fistula tract and underlying etiology 6
   • Water-soluble contrast studies may help delineate the tract 6

Management Implications

The presence of this complication suggests:

• Need for specialist referral: Colorectal surgery consultation is mandatory
• Delayed definitive repair: Most cases require initial drainage/diversion followed by staged repair 4
• Consider fecal diversion: Particularly for recurrent fistulas or those associated with IBD 4
• Martius flap technique: Highly effective for recurrent low rectovaginal fistulas, with better outcomes than simple advancement flaps 1, 4

Critical Pitfalls to Avoid

1. Do not assume it's purely surgical complication - Always investigate for Crohn's disease given the 64% association 5
2. Do not attempt immediate repair - These fistulas require infection control first, often with temporary diversion 4
3. Do not miss the diagnosis - Median time to diagnosis is 8 months (range 1-15 months) due to symptom confusion with incontinence 5
4. Recognize anatomic complexity - These are typically high trans-sphincteric or suprasphincteric fistulas, not simple low tracts 5

Prognosis

With appropriate management, successful repair is achievable in most cases. All eight attempted repairs in one series remained healed at follow-up, including five patients with underlying inflammatory bowel disease 5. However, recurrence rates are significant with initial simple repairs, necessitating more complex techniques like Martius flap for definitive treatment 1, 4.