Treatment Approach for Vaginal Fistula

Classification and Diagnosis

Vaginal fistulas are classified based on the connecting structure and complexity, with initial diagnosis requiring imaging to define fistula anatomy, and MRI being the preferred modality for comprehensive assessment 4, 5
Endoanal ultrasound can be used as an alternative or complementary imaging technique, with reported PPV of 90-100% for fistula identification 6
Vaginography has high sensitivity and PPV for identification of fistulous tracts and can be useful in certain clinical scenarios 6

Initial management should include control of any underlying inflammation, particularly in cases associated with Crohn's disease, with medical therapy used first to control active luminal disease, and anti-TNF agents showing effectiveness in up to 45% of rectovaginal fistulas 1, 2
Surgical repair should only be performed after endoscopic healing of rectosigmoid mucosa, with options including transanal or transvaginal advancement flaps for symptomatic fistulas with healed rectal mucosa 2
Seton placement is recommended for complex fistulas or those with active inflammation 5

Enterovaginal fistulas often require resective surgery, especially when associated with abscess, bowel stricture, or causing excessive diarrhea and malabsorption 5

For complex perianal fistulas, a combination of seton placement and medical therapy is recommended 5, 3
For refractory cases not responding to medical and surgical treatment, diverting ostomy may be considered 1, 2
Proctectomy should be considered only as a last resort for severe disease with irreversible perineal destruction 2, 3

Asymptomatic low anal-introital fistulas may not require surgical treatment 5
Clinical closure does not equal MRI closure, with high risk of recurrence without complete fibrotic tract on MRI 3

Regular follow-up with clinical assessment is usually sufficient to evaluate treatment response, with MRI or anal endosonography recommended to evaluate improvement of fistula track inflammation 5
Monitoring for development of malignancy in chronic fistula tracts is recommended, particularly in long-standing cases 3