Can you tell me about pancreaticoduodenectomy or pancreatic duodectomy?

Whipple operation: Most tumors of pancreas are adenocarcinomas arising in the head of the pancreas. The tumor is ductal in origin, several mm. away from the bile duct . which when invaded produces jaundice. To remove the lesion, the head of the pancreas is resected with its ducts entering the ampulla of Vater in the medial wall of the duodenum, thus pancreatico duodenectomy