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A gastrointestinal fistula is an abnormal opening in the stomach or intestines that allows the contents to leak to another part of the body.

• Leaks that go through to a part of the intestines are called entero-enteral fistulas.
• Leaks that go through to the skin are called enterocutaneous fistulas.
• Other organs can be involved, such as the bladder, vagina, anus, and colon.