Gastrointestinal surgery is divided into upper GI surgery and lower GI surgery. Upper GI Surgery includes surgery for gastro-oesophageal reflux, Gall bladder disease, Hernias, benign oesophageal and gastric disorders, other benign pancreatic and hepatobiliary disorders. Lower gastrointestinal surgery includes colorectal surgery and surgery of the small intestine. Gastrointestinal surgery is a treatment for diseases of the parts of the body involved in digestion. This includes the Oesophagus (ee-sof-uh-gus), stomach, small intestine, large intestine, and rectum. It also includes the liver, gallbladder, and pancreas Hepatectomy is the surgical resection of the liver completely or a small part.