Endoscopy By Jonathan Gotfried, MD, Lewis Katz School of Medicine at Temple University Reviewed / Revised Mar 2023 View Patient Education Diagnostic Gastrointestinal Endoscopy Therapeutic Gastrointestinal Endoscopy Contraindications to Gastrointestinal Endoscopy Preparation for Gastrointestinal Endoscopy Video Capsule Endoscopy More Information Topic Resources Endoscopy (Esophagus) Endoscopy (Stomach) Endoscopy (Large Intestine) Flexible endoscopes equipped with video cameras can be used to view the upper gastrointestinal tract from pharynx to proximal duodenum and the lower gastrointestinal tract from anus to cecum (and, sometimes, terminal ileum).