Abstract
Duodenal epithelial tumors are rare, and gastroenterologists have had little interest in the tumors. However, the incidence of duodenal carcinoma has been increasing over the past decade due to the widespread use of esophagogastroduodenoscopy and the advancement of an aging society in Japan. Accordingly, accurate diagnosis, characterization and determination of tumor extent by magnification endoscopy are sought for epithelial tumors in the duodenum as they are with tumors of the stomach and colorectum. Combining novel image-enhanced techniques (e.g., narrow-band imaging) with magnifying endoscopy allows us to visualize the microstructure of the mucosal surface including microvessels. It is important not to overlook small lesions that would be a good candidate for magnifying endoscopic diagnosis. This paper describes our original procedure of routine duodenoscopy as well as optimal techniques and key diagnostic points of magnifying endoscopy in the duodenum.
