Synchronous Pancreatic Serous Cystic Neoplasm and Duodenal Neuroendocrine Tumor: Case Report and Review of the Literature.

Simultaneous presence of pancreatic serous cystic neoplasms and neuroendocrine neoplasms is rare. We present a case with the incidental finding of a duodenal neuroendocrine tumor (NET) with 2 lymph node metastases in a Whipple resection specimen performed to remove a pancreatic cystic neoplasm that postoperatively turned out to represent a serous cystic neoplasm (SCN). The patient was a 75-year-old female. She presented with loss of appetite and weight. Preoperative contrast-enhanced computed tomography scan of the abdomen showed a multicystic lesion in the head of pancreas. On histologic examination of the resection specimen, a pancreatic SCN was found, and in addition in 2 peripancreatic lymph nodes, metastases from a NET. Further examination of the resected specimen revealed a duodenal NET. Review of the literature revealed only one prior study with 4 cases of pancreatic SCN associated with a duodenal NET. In 1 of the 4 cases, the patient had von Hippel-Lindau disease. Our report emphasizes the importance of careful examination of pancreatic resection specimens including the peripancreatic lymph nodes also when dealing with SCNs, as coexisting and more malignant tumors may otherwise be missed.