Concomitant intraductal papillary mucinous neoplasm and pancreatic endocrine tumour: Report of two cases and review of the literature.

It has been suggested that the occurrence of intraductal papillary mucinous neoplasms in association with pancreatic endocrine tumours is more frequent than expected [Goh BK, Ooi LL, Kumarasinghe MP, Tan YM, Cheow PC, Chow PK, et al. Clinicopathological features of patients with concomitant intraductal papillary mucinous neoplasm of the pancreas and pancreatic endocrine neoplasm. Pancreatology 2006;6:520-6]. Up to now, 10 patients with concomitant intraductal papillary mucinous neoplasms and pancreatic endocrine tumours have been reported [Goh BK, Ooi LL, Kumarasinghe MP, Tan YM, Cheow PC, Chow PK, et al. Clinicopathological features of patients with concomitant intraductal papillary mucinous neoplasm of the pancreas and pancreatic endocrine neoplasm. Pancreatology 2006;6:520-6; Zhao X, Stabile BE, Mo J, Wang J, French SW. Nesidioblastosis coexisting with islet cell tumor and intraductal papillary mucinous hyperplasia. Arch Pathol Lab Med 2001;125:1344-7; Marrache F, Cazals-Hatem D, Kianmanesh R, Palazzo L, Couvelard A, O'Toole D, et al. Endocrine tumor and intraductal papillary mucinous neoplasm of the pancreas: a fortuitous association? Pancreas 2005;31:79-83]. In most cases the synchronous existence of both tumours was incidentally discovered after the examination of the surgical specimen. We report two additional patients with intraductal papillary mucinous neoplasms and pancreatic endocrine tumours, in whom both tumours were diagnosed before surgery.