Fistula formation is defined as?

• A. An abnormal passage between two or more structures or spaces.
• B. A narrowing of a duct.
• C. A superficial skin lesion.
• D. A normal anatomical connection.

Answer: (A)

Fistula formation is an abnormal passage between two structures or spaces that do not normally connect. This creates a tract that can link sites such as bowel to skin, bladder to vagina, or two loops of intestine, and it often drains fluid continuously. Fistulas develop from ongoing inflammation or infection, tissue damage from trauma or surgery, or diseases like Crohn’s disease. In ostomy care, a fistula near the stoma can cause effluent to leak onto the skin, making seal and skin protection more challenging and requiring targeted management strategies. A narrowing of a duct is a stricture, a superficial skin lesion is not a tract, and a normal anatomical connection is simply normal anatomy.