The authors performed 3539 successful endoscopic retrograde cholangio-panreatographies between 1982 and 1992. In 1160 (32.7%) of the cases was revealed some kind of pathological condition. In connection with one case, following conventional cholecystectomy, a very rare complication was diagnosed by endoscopic means. There was a stent-like object, hanging into the duodenal lumen, through a parapapillar fistula. This was surgically removed. It turned retrospectively out that the removal of K-32 feeding tube used as a transcystic drain 18 years earlier had managed only partially. After this period of time did it cause a biliary flow obstruction and a choledocho-duodenal fistula. The endoscopic diagnostic possibilities, course of disease and treatment is presented hereby.