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. 2019 Jun 11;19:52. doi: 10.1186/s12894-019-0477-1

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© The Author(s). 2019

Open AccessThis 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. 1 — a Surgical specimen of excised simple testicular epidermoid cyst. Largest diameter of cyst 1.2 cm. Note the sharply demarcated rim of cyst and the yellowish amorphic mass inside. At the external side of the rim small layer of normal testicular tissue (brownish). b B-mode sonography of testis harbouring epidermoid cyst. Note the typical onion ring shape of the cyst core. c, d Contrast enhanced ultrasonography (CEUS) of testis with simple epidermoid cyst. Dual display with B-mode scan (right side of figure) and CEUS imaging (left side of figure). Note the absence of contrast material (air bubbles) in the centre of the cyst, indicating avascular area