Portal vein tumor thrombosis after pancreaticoduodenectomy: an extremely rare case of recurrence of pancreatic neuroendocrine neoplasm.

A 79-year-old man was referred to our hospital with suspected portal vein tumor thrombosis (PVTT) after pancreaticoduodenectomy for pancreatic neuroendocrine neoplasm. He underwent subtotal stomach-preserving pancreaticoduodenectomy with a modified Child reconstruction for pancreatic neuroendocrine neoplasm G2 (Ki-67 index of 15%) without portal vein invasion 4 years ago (Figure 1a) and underwent regular follow-up in the previous hospital.