balloon assisted enteroscopy

enteroscopy stomach endoscopy esophagus intestine bowel small endoscopic gastric muscle procedure treatment achalasia minimally vector gastroscopy invasive disorder mucosa submucosa endoscope esophageal les tunnel nonsurgical sphincter fibers stricture anatomical junction digestive system illustration gastrointestinal silhouette human body graphic poster therapy gastroesophageal disease digestion anatomy wall medical flat examination diagram gut