Surgeries related to the upper gastrointestinal tract as well as the lower gastrointestinal tract are under the scope of gastrointestinal surgery. The practice of surgery whose focus of study is on the upper parts of the gastrointestinal tract is called upper gastrointestinal surgery or upper GI surgery. Lower gastrointestinal surgery or lower GI surgery is the type of surgery which is concerned with colorectal surgery and the surgery of the small intestine. The main operations performed by upper GI surgeons include liver resection, pancreaticoduodenectomy and esophagectomy, whereas, lower GI surgeons perform operations like colectomy and low or ultralow resections for rectal cancer. This book provides comprehensive insights into the field of gastrointestinal surgery. It includes some of the vital pieces of work being conducted across the world, on various topics related to gastrointestinal surgery. Those in search of information to further their knowledge will be greatly assisted by this book.