Atlas of Exocrine Pancreatic Tumors: Morphology, Biology, - download pdf or read online

By Parviz M. Pour M.D., Yoichi Konishi M.D. (auth.), Parviz M. Pour M.D., Yoichi Konishi M.D., Günter Klöppel M.D., Daniel S. Longnecker M.D. (eds.)

The class of tumors is critical for realizing tumor histogenesis, for predicting analysis, for differential prognosis, and for recommending acceptable treatment. due to the fact that 1836, while pancreatic melanoma was once first defined, development has been made in pancreatic melanoma morphology, and a couple of classifications were proposed. All of those classifications are regularly in response to morphological features. a few are too unique to be of useful use whereas others are extra pragmatic. the various inherent difficulties within the past classifications incorporated problems in acquiring an enough variety of pan­ creatic tumors for exam and inadequate scientific information and follow-up. With the expanding occurrence of pancreatic melanoma in lots of components of the area up to now six many years, and with the provision of extra tumors to patho­ logists, advances were made in pancreatic tumor reports. Classifications via Cubilla and Fitzgerald and through Kloppel, that are in general comparable, as a rule thought of in demand morphological beneficial properties and their histogenesis. those pathology-oriented classifications, even supposing whole, weren't sensible from the perspective of clinicians considering the diagnosis of person tumors.

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Additional info for Atlas of Exocrine Pancreatic Tumors: Morphology, Biology, and Diagnosis with an International Guide for Tumor Classification

Sample text

Golgi complex (G) in an acinar cell. Z, Zymogen process of exocytosis. The zymogen granules apgranules; CV, condensing vacuole; RER, rough endoproach the apical plasma membrane. The memplasmic reticulum. (X 20 000) branes of the granules and the cell apex touch mucoprotein layer. Bundles of micro filaments from and then fuse. The contents of the granules are the core of the microvilli. They are actin filaments, then discharged into the acinar lumen (Fig. 3a,b). as demonstrated immunocytochemically [9].

They are joined to adjacent acinar cells by junctional complexes, and their lateral membranes form interdigitations (Fig. 5). Their basal membrane rests on a basal lamina that is continuous with that underlying the adjacent acinar cells. They have rounded nuclei like acinar celis, but they do not contain zymogen granules (Fig. 4). Their cytoplasm appears clear because it Pancreatic Ductal System Two large ducts drain pancreatic juice into the duodenum. These are the main and accessory pancreatic ducts (ducts of Wirsung and Santorini, respectively).

The nucleoli are indistinct and the chromoplasm is finely granular. The epithelial cells of both tumors possess abundant cytoplasmic periodic acid schiff (PAS)-positive granules that can be completely digested by diastase (Fig. 9) . No mucin is demonstrated by special stains. The cysts are separated by collagenous tissue with a capillary network. This stromal component is extremely scant in some areas, while it is abundant and markedly hyalinized in others. The stroma often contains calcification, hemosiderin granules, and cholesterol clefts.

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