[Severe diarrhea after the original well-functioning percutaneous endoscopic gastrostomy tube was replaced by a Mic-Key button].

We report two cases of colocutaneous fistula as a complication of percutaneous endoscopic gastrostomy (PEG) in small children. Both children developed severe osmotic diarrhoea immediately after the original PEG tube was replaced by a Mic-Key button which subsequently migrated to the colon.