Intraductal oncocytic papillary carcinoma with invasion arising from the accessory pancreatic duct

Abstract

Mucin-producing tumors of the pancreas were first reported by Ohhashi and Takagi in 1980.1 Since then, many cases of intraductal papillarymucinous tumors (IMPTs) of the pancreas, which are similar to mucin-producing tumors of the pancreas, have been reported.2 IMPTs are generally regarded as tumors with a favorable prognosis. However, those with associated infiltration, noted in up to 25% of cases, are often mucinous and clinically indolent.3 Furthermore, some IMPTs exhibit ductal type infiltration and these are always associated with a poor prognosis.4 Intraductal oncocytic papillary neoplasms (IOPNs) of the pancreas have also been reported; these have the potential to develop into invasive carcinoma.5 Most IMPTs arise from the main pancreatic duct and IMPTs arising from the accessory pancreatic duct are relatively rare, there being only 6 reported cases.2,6-10 We present a case of invasive IPON arising from the accessory pancreatic duct.