Fig. 2From: Gastroenteropancreatic neuroendocrine tumor of the accessory papilla of the duodenum: a case reportThe tumor at the accessory papilla as the accessory pancreatic duct (arrow) is shown. Hematoxylin and eosin stain demonstrating nesting pattern of mostly uniform cells with central ovoid nucleus (a). The lymph node metastasis (b). Synaptophysin showing positive (c). Ki-67 index stain showing < 1% proliferation (d)Back to article page