RESUMEN
For intestinal Behcet's disease, the common complications are intestinal perforation, bleeding and fistula formation. Among these, fistula formation is mostly associated with previously performed surgeries and it is rare that fistulas form spontaneously. We experienced a case of Behcet's disease with duodenoileal fistula, and the patient does not have any previous surgery. A 57-year-old male patient was admitted due to persistent diarrhea and weight loss. He was diagnosed with intestinal Behcet's disease 6 years ago. On the 2nd portion of the duodenum, an opening to the colon was found on gastroduodenoscopy. As we rechecked the lesion with performing a gastrograffin upper GI series, there was a fistula between the 2nd portion of the duodenum and ileum. So we performed right hemicolectomy and duodenojejunostomy and we confirmed the duodenoileal fistula. Overall, we would like to suggest that this case was a case of Behcet's disease with spontaneous duodenoileal fistula.