Masui T, et al. - Researchers here evaluated the clinicopathologic characteristics of pancreatic neuroendocrine neoplasms (PanNEN) and duodenal neuroendocrine neoplasms (DuNEN). In addition, they assessed the risk factors as well as the recurrence types after resection. They noticed that most initial recurrences of PanNEN occurred in the liver, whereas those of DuNEN appeared in lymph nodes. This suggested the necessity for proper diagnosis of the primary site and appropriate imaging methods for surveillance after resection.