Journal
PANCREAS
Volume 38, Issue 1, Pages 8-16Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/MPA.0b013e318181b90d
Keywords
intraductal papillary-mucinous neoplasm; pancreas; minimal invasion; diagnostic score; prognostic factor
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Funding
- Ministry of Health, Labor and Welfare of Japan
- Ministry of Education, Culture, Sports, Science and Technology of Japan
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Objective: We aimed to investigate preoperative. findings that are useful to distinguish intraductal papillary-mucinous neoplasm (IPMN) subtypes. Methods: One hundred twenty-three patients who underwent pancreatectomy for IPMN were analyzed clinicopathologically and radiologically. Invasive IPM carcinomas (IPMCs) were subdivided into early-stage nonaggressive (minimally invasive IPMC [MI-IPMC]) and more advanced and aggressive (invasive carcinoma originating in IPMC [ICIPMC]) subtypes according to our recently proposed pathological criteria. Results: The lesions consisted of 27 IPMNs with low-grade dysplasia, 14 IPMNs with moderate dysplasia, 21 IPMNs with high-grade dysplasia, 30 MI-IPMCs, and 31 IC-IPMCs. Multidetector-row computed tomography detected a component of invasive carcinoma in IC-IPMC with 86% sensitivity and 100% specificity. In patients with IPMNs other than IC-IPMC, multivariate analysis demonstrated 3 significant predictive factors of malignancy: IPMN size (940 mm), IPMN duct type (main pancreatic duct or mixed type), and the presence of a mural nodule or thick septum. The diagnostic score obtained using these 3 factors showed a strong correlation with the presence of malignancy. Conclusions: For preoperative evaluation of patients with IPMN, it is recommended to rule out IC-IPMC using multidetector-row computed tomography and then to categorize IPMN other than IC-IPMC according to malignant potential based on the diagnostic score.
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