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. 2020 Mar 17;2020(3):rjaa045. doi: 10.1093/jscr/rjaa045

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Published by Oxford University Press and JSCR Publishing Ltd. All rights reserved. © The Author(s) 2020.

This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)

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Retroperitoneal mucinous cystadenoma in a 32-year old woman presenting with chronic abdominal pain and a mass in left iliac fossa. (A) The section shows full thickness of the cyst wall, which is lined by a single layer of mucinous epithelium (thin arrows) alternating with attenuated mesothelial cells (thick arrows) (hematoxylin & eosin stain, ×100 magnification). (B) Immunochemistry for calretinin highlights the mesothelial lining (thick arrows) and is negative in the mucinous epithelium (thin arrows) (calretinin stain, ×100 magnification). (C) Immunochemistry showing nuclear positivity for oestrogen receptor in the mesothelial lining and stromal cells (oestrogen receptor stain, ×100 magnification).