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What causes a fistula? After an abscess has been drained, a passage may remain between the anal gland and the skin, resulting in a fistula. If the gland does not heal, there will be persistent drainage through this passage. If the outside opening of the fistula heals first, a recurrent abscess may develop.
Only 0.6% of carcinomas of the colon lead to fistula formation. Colovesical fistulae occur more commonly in males, with a male-to-female ratio of 3:1. The lower incidence in females is thought to be due to interposition of the uterus and adnexa between the bladder and the colon.he mean duration of Crohn disease at the time of first symptoms of fistula formation is 10 years, and the average patient age is 30 years. Less common inflammatory causes of colovesical fistulae include Meckel diverticulum, genitourinary coccidioidomycosis, and pelvic actinomycosis.