CASE REPORTS
JOURNAL ARTICLE
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A case of mixed adenoneuroendocrine carcinoma of the pancreas mimicking intraductal papillary mucinous carcinoma.

A previously healthy 52-year-old man was referred to our hospital for further evaluation of main pancreatic duct dilatation. The preoperative work-up was consistent with intraductal papillary mucinous carcinoma (IPMC) derived from a mixed type intraductal papillary mucinous neoplasm (IPMN), because multilocular cysts with enhancing thickened pancreatic head walls and dilated pancreatic ducts lined with dysplastic mucinous epithelium, with papillary proliferation from the pancreatic body to the tail, were observed; in addition, the pancreatic juice cytology was class V, which is suggestive of adenocarcinoma. Total pancreatectomy was performed because a definite mass was not found before surgical resection and the tumors could have spread to the tail. The pathological diagnosis was mixed adenoneuroendocrine carcinoma of the pancreatic head. IPMN with high- or low-grade dysplasia was not observed anywhere in the pancreatic duct. The pancreatic ductal adenocarcinoma consisted of large caliber malignant glands with intraluminal flat or papillary structures; therefore, we were unable to recognize a definite pancreatic mass before surgical resection, and suspected an IPMC derived from a mixed type IPMN.

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