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. 2019 Aug 14;14:88. doi: 10.1186/s13000-019-0865-6

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© The Author(s). 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Right ovarian tumor. a Macroscopic examination shows a cystic tumor filled with greasy, yellow sebaceous material and a firm, well-demarcated, white nodule. b Microscopic examination shows the cystic wall covered with keratinizing stratified epithelium (H&E). c Microscopic examination shows the firm nodule consisted of neoplastic glandular components that contained scattered mucinous cells with signet ring features, focally forming small clusters without distinct glandular lumens (H&E). Immunohistochemical staining shows (d) CDX-2, (e) SATB2, and (f) CD56 (focal) positivity