The essential guide to mastering endoscopic techniques of the upper GI tract While technological advances have made endoscopy one of the most common procedures for examining the upper GI tract, learning how to maneuver the instruments and interpret the images can be frustrating for those without experience. Designed specifically for those in training, Endoscopy of the Upper GI Tract -- with its more than 770 illustrations and user-friendly format -- is the most comprehensive instructional guide available.