What is the etiology of colocutaneous fistula with PEG tube placement?

• A. Inadvertent puncture of the colon during PEG tube placement
• B. Migration of the tube into the small intestine
• C. Bowel ischemia
• D. Gastric ulcer erosion into the abdominal wall

Answer: (A)

In this situation, the key idea is that a colocutaneous fistula after PEG tube placement most often results from accidentally puncturing the colon during the procedure. If the colon lies between the stomach and the abdominal wall, the PEG instrument or tube can pass through colon tissue as it is being positioned. That creates a tract that connects the colon to the skin around the stoma, allowing colonic contents to drain through the PEG tract and establish a persistent fistulous connection to the skin.

This is why inadvertent colon puncture is the best explanation for a colocutaneous fistula. Other scenarios—such as the tube migrating into the small intestine, bowel ischemia, or a gastric ulcer eroding into the abdominal wall—do not explain a fistula that directly links the colon to the skin around the PEG site. Prevention hinges on proper technique and confirming that the stomach is in the right position and not overlain by the colon before placing the tube.