Upper gastrointestinal surgery is a sub-specialty within general surgery which focuses on disorders of the oesophagus, stomach, small bowel, liver, gallbladder, biliary tree, pancreas, and spleen. These range from benign conditions such as gallstones and cysts to pre-malignant conditions and cancers. Treatment of upper gastrointestinal cancers is often complex and requires coordination among radiology, gastroenterology, surgery, medical oncology, radiation oncology, and other branches of medicine.