PMID: 15362784Sep 15, 2004Paper

Intraductal papillary-mucinous tumors of the pancreas

Hepato-gastroenterology
Hitoshi KubosawaTakenori Ochiai

Abstract

To elucidate the risk of malignancy and the morphological alterations associated with malignancy. Thirty cases of intraductal papillary-mucinous tumors and 5 papillary-mucinous carcinomas (invasive intraductal papillary-mucinous tumors) of the pancreas were clinicopathologically and histopathologically analyzed. The invasive carcinoma developed on the basis of severe dysplasia-carcinoma in situ changes and never from mild or moderate dysplasia changes. However, tumor cell projections of intraductal papillary-mucinous tumors encroached into the duct wall and/or the stroma introduced just beneath the epithelium and "intraductal" tumor cells sometimes came in direct contact with the "extraductal" connective tissues even in adenomas. The frankly invasive adenocarcinoma components of invasive intraductal papillary-mucinous tumors were characterized by the lack or poor formation of their own basement membrane and were usually surrounded by the extensive collagenous proliferation, desmoplastic reaction. Such stromal alterations never developed around the "extraductal" components of non-invasive intraductal papillary-mucinous tumors. The risk of malignancy for an individual intraductal papillary-mucinous tumor was increased with the de...Continue Reading

Related Concepts

Related Feeds

Carcinoma, Ductal

Ductal carcinoma is a malignant neoplasm involving the ductal systems of any of a number of organs, such as the mammary glands, pancreas, prostate or lacrimal gland. Discover the latest research on ductal carcinoma here.

Carcinosarcoma

Carcinosarcoma is a malignant neoplasm that contains elements of carcinoma and sarcoma so extensively intermixed as to indicate neoplasia of epithelial and mesenchymal tissue. Discover the latest research on carcinosarcoma here.