Fig. 2From: Complete closure of a colo-duodenal fistula in a patient with advanced ascending colon cancer after pembrolizumab combined with radiation therapy: a case reportUpper gastrointestinal endoscopy. Colo-duodenal fistula at the second portion of the duodenum (a). After combined treatment of pembrolizumab and radiation therapy, follow-up upper gastrointestinal endoscopy showed that the colo-duodenal fistula had closed (b)Back to article page