Definition of "fistula"

Small fistulæ are to be closed bilaterally in an antero-posterior line […]

1903, William Rice Pryor, Gynæcology, page 113

There are several reasons why a manual on this disease should be a part of the veterinary literature of the day, the chief one being that fistula of the withers is a very prevalent disease of horses and thus exacts a big toll from the horse industry.

1917, Louis Adolph Merillat, Fistula of the Withers and Poll-Evil, page 5

Fistulas are abnormal communications between two epithelialized surfaces. The causes of enterocutaneous fistulas can be remembered using the mnemonic FRIEND: Foreign body, Radiation, Inflammation/Infection/Inflammatory bowel disease, Epithelialization, Neoplasm, and Distal obstruction. Fifteen to twenty-five percent of enterocutaneous fistulas arise spontaneously as in, for example, Crohn's disease or cancer.

1998, Scott Fisher, “Enterocutaneous Fistulas”, in Theodore J. Saclarides, Keith W. Millikan, editors, Common Surgical Diseases: An Algorithmic Approach to Problem Solving‎, page 164

An intestinal fistula is an unwanted pathway from intestines to other organs (e.g., the bladder).

2008, Sylvia Escott-Stump, Nutrition and Diagnosis-related Care, page 405