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. 2018 May 22;8(2):129–130. doi: 10.4103/eus.eus_12_18

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(a-d) Histological findings in the surgically resected specimen. (a) The main pancreatic duct in the head of the pancreas was occluded by a solid tumor. (b) A component in the branch duct was mainly a ductal component. (c) A component in the main pancreatic duct was mainly a neuroendocrine component (yellow square). (d) The transitional zone with minimal invasion into the pancreatic parenchyma was observed in the branch duct adjacent to the main pancreatic duct. (e-h) Immunohistochemically, a ductal component was positive for carcinoembryonic antigen (e), but not for synaptophysin (f), while a neuroendocrine component was positive for synaptophysin neuroendocrine component (g), not for carcinoembryonic antigen (h)