Internal Medicine
Online ISSN : 1349-7235
Print ISSN : 0918-2918
ISSN-L : 0918-2918
CASE REPORTS
Oncocytic Type Intraductal Papillary Mucinous Neoplasm of the Pancreas with Unusually Low Mucin Production Mimicking Intraductal Tubulopapillary Neoplasm: A Report of a Case Diagnosed by a Preoperative Endoscopic Biopsy
Yukinari YoshidaTakao EndoEiichi TanakaTakefumi KikuchiKimishige AkinoHiroaki MitaYasuyo AdachiMasahiro NakamuraYasushi AdachiYoshifumi IshiiJoe MatsumotoSatoshi HiranoTakeo NittaTomoko MitsuhashiYasuo Kato
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JOURNAL OPEN ACCESS

2017 Volume 56 Issue 23 Pages 3183-3188

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Abstract

We herein report the case of a 78-year-old woman with an intraductal tumor with scant mucin production in a moderately dilated main pancreatic duct that resembled an intraductal tubulopapillary neoplasm (ITPN) on imaging. An endoscopic transpapillary forceps biopsy enabled an accurate preoperative diagnosis of the tumor as an oncocytic type intraductal papillary mucinous neoplasm (IPMN) of the pancreas microscopically showing papillary growth consisting of oncocytic cells with a typical mucin expression profile, although with few intraepithelial lumina containing mucin. This is the first case of an oncocytic type IPMN mimicking an ITPN that was able to be diagnosed preoperatively.

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© 2017 by The Japanese Society of Internal Medicine
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