esophagogastroduodenoscopy medical procedure

esophagogastroduodenoscopy esophagus endoscopic egd duodenum stomach upper endoscope gastric muscle procedure treatment achalasia minimally vector gastroscopy invasive disorder endoscopy mucosa gastrointestinal reflux oropharynx submucosa esophageal les tunnel nonsurgical sphincter fibers anatomical junction digestive system gastroenterologist illustration silhouette human body colon intestine bowel display video examination enteroscopy therapy gastroesophageal tiny small