what is egd surgery?
<answer> It is a diagnostic procedure that is performed to view the esophagus, stomach, and duodenum <context> Definition. An esophagogastroduodenoscopy (EGD), which is also known as an upper endoscopy or upper gastrointestinal endoscopy, is a diagnostic procedure that is performed to view the esophagus, stomach, and duodenum (part of the small intestine).