esophagogastroduodenoscopy medical procedure

esophagogastroduodenoscopy esophagus endoscopic egd duodenum stomach upper endoscope gastric muscle procedure treatment achalasia minimally vector gastroscopy invasive disorder endoscopy mucosa gastrointestinal acid reflux oropharynx submucosa esophageal les tunnel nonsurgical sphincter fibers stricture anatomical junction digestive system gastroenterologist illustration silhouette human body display video anatomy gut medicine acidic camera chest eating