The Whipple procedure, also known as a pancreaticoduodenectomy, is a complex surgical operation primarily used to treat diseases of the pancreas, duodenum, and bile duct. In this procedure, a portion of the pancreas, the duodenum, the gallbladder, and sometimes part of the stomach are removed. While more common in adults, it can also be necessary in pediatric cases for conditions like pancreatic tumors or severe chronic pancreatitis.