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. 2019 Mar 22;6:83. doi: 10.3389/fvets.2019.00083

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Copyright © 2019 Balao da Silva, Gómez Gordo, Cuesta Gerveno, Ortega-Ferrusola, Martín-Muñoz, Duque Carrasco, Parejo and Peña Vega.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Paratesticular tissue, dog. (a) Histopathological study of the sample. Proliferation of loose connective tissue composed of fusocellular cells with slight atypia (arrows). Hematoxylin and eosin (HE). (b) Actin immunohistochemical stain. This stain highlights the presence of numerous cells which show a fusiform morphology (arrowheads). (c) Ki67 immunohistochemical stain of the lesion. Presence of fusiform cells expressing this marker, indicating cell proliferation (arrowheads). (d) Vimentin immunohistochemical stain in which it is observed several immunolabeled cells disposed with diffuse pattern and morphology that points to a mesenchymal origin (arrowheads).