Case Studies in Gastroenterology - Hardcoverby Creed Moore (Editor) Gastroenterology is a branch of medicine which focused on the study, diagnosis and treatment of disorders related to the digestive system. The digestive system encompasses organs such as the esophagus, stomach, small intestine, large intestine, liver, gallbladder and pancreas. The field of gastroenterology is involved in the diagnosis and management of a wide range of disorders, such as the gastroesophageal reflux disease