Clinical case: pancreaticoduodenectomy. The tumor was located in the head of the pancreas, and a pancreaticoduodenectomy was performed. In this patient, the right hepatic vein (RHV) originated from the superior mesenteric artery and ran along the posterior side of the portal vein (PV). The ligated gastroduodenal artery (GDA) and adjacent hepatic bile duct were visualized. Resection of the pancreatic parenchyma (P) was performed in the same manner as the actual operation.