Which of the following is an external fistula example?

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Multiple Choice

Which of the following is an external fistula example?

Explanation:
An external fistula is a tract that drains to the exterior of the body, either onto the skin or through an external opening. The connection between the jejunum and the rectum ends at the rectum/anus, so the fistulous channel can communicate with the outside via the anal canal. That external drainage pathway is what makes it an external fistula in this context. The other options connect internal organs to each other (small intestine to colon, colon to bladder, pancreas to colon) and do not provide a direct pathway to the skin or an exterior opening, so they are considered internal fistulas.

An external fistula is a tract that drains to the exterior of the body, either onto the skin or through an external opening. The connection between the jejunum and the rectum ends at the rectum/anus, so the fistulous channel can communicate with the outside via the anal canal. That external drainage pathway is what makes it an external fistula in this context. The other options connect internal organs to each other (small intestine to colon, colon to bladder, pancreas to colon) and do not provide a direct pathway to the skin or an exterior opening, so they are considered internal fistulas.

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