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Fistula in Ano

Suggested Pre-Referral Evaluation and Management Guidelines View photos of Fistula in ano:
Fistula in Ano
Anal fistula

The usual symptoms of fistula in ano are intermittent perianal swelling and drainage or continuous mucoid or brown-stained drainage from a site in the perianal skin, which results from a communication between the anal canal and the perianal tissues. The cause is unknown.

Fistula in ano is sometimes preceded by perianal abscess, but not always. Persistent drainage 6-8 weeks after drainage of a perianal or perirectal abscess is a sign of an underlying anal fistula.

Although some patients with inflammatory bowel disease have fistulas, the vast majority of patients with fistula-in-ano do not have inflammatory bowel disease.

The treatment is surgical. Surgical consultation is indicated for any patient with suspected fistula-in-ano.

Antibiotics are of no value in the absence of acute infection, which is rare.

Suggested Additional Test/Management Prior to Specialty Visit None. MRI in particular is not necessary prior to surgical evaluation, nor is colonoscopy.
Patient Education/Information (includes preps)

If patient has history of constipation or hard bowel movements, attempt should be made to correct this, as it may have been causative.

A high fiber diet can be achieved by daily use of a high fiber cereal (i.e., All-Bran, Fiber One, Bran Buds, Kashi cereals with >10 grams of fiber per serving) ? to 1 cup of cereal daily.


by using a fiber supplement (i.e., Metamucil, Citrucel, Benefiber, etc.). A sufficient amount must be taken daily to give 10-20 grams of fiber. This usually means tablespoons not teaspoons of supplement.

OR both.

The added fiber must be taken every day. It is not a cathartic. Beneficial effects take days to weeks as the colon adapts to the new diet.

Miralax is another alternative, but should be reserved for patients who cannot tolerate or are unable to manage a high fiber diet.

For patients with severe, chronic constipation, or in whom one is concerned about dysmotility, referral to the Michigan Bowel Control Program is suggested.

Appointment Timeframe Dictated by condition. Patients with an acute fistula should be sent to the emergency department for immediate care.

Patients with treated, chronic, or recurrent problems will be seen within 6-8 weeks
How to Get Results to Consultant UMHS Patients: See MiChart
External Patients: Hand carry Non-UM records to visit
Reports and/or medical records can be faxed to 734-232-6189

CDs can be hand-carried to the appointment

Reports, medical records, CDs, and pathology slides can be mailed to:
Division of Colorectal Surgery
Attention: Jain Carver
2124 Taubman
1500 East Medical Center Drive, SPC 5343
Ann Arbor, MI 48109-5343
Clinic Contact Information Physicians: 800-962-3555
Patient: 734-615-7565
Clinic Location Sites Colorectal Surgery Clinic
UM Consulting Physician Colorectal Surgery Physicians
Revised on: 12/21/2015



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