[A case of ulcerative colitis complicated by internal fistula between the transverse colon and stomach].

A case of ulcerative colitis (UC) with an internal fistula was reported;the patient, a 42-year-old male, was admitted to the hospital with a diagnosis of refractory UC. The preoperative examination revealed an internal fistula between the transverse colon and the stomach. UC was diagnosed preoperatively with an internal fistula, but the possibility of Crohn's disease could not be ruled out at that time. The patient underwent subtotal colectomy with end ileostomy, sigmoid colon mucous fistula, and partial gastrectomy. UC was diagnosed histopathologically, and an ileal pouch-anal anastomosis was performed. An internal fistula can complicate UC;a split surgery is recommended with the possibility of Crohn's disease in the patient.