An anorectal fistula is a tubelike tract with one opening in the anal canal and the other usually in the perianal skin. Symptoms are discharge and sometimes pain. Diagnosis is by examination and sigmoidoscopy. Treatment often requires surgery.
(See also Evaluation of Anorectal Disorders.)
Fistulas arise spontaneously or occur secondary to drainage of a perirectal abscess. Most fistulas originate in the anorectal crypts. Predisposing causes include
Fistulas in infants are congenital and are more common among boys.
Rectovaginal fistulas may be secondary to Crohn disease, obstetric injuries, radiation therapy, or cancer.
Last modified in- ByParswa Ansari