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. 2020 Jan 31;99(5):e18814. doi: 10.1097/MD.0000000000018814

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Copyright © 2020 the Author(s). Published by Wolters Kluwer Health, Inc.

This is an open access article distributed under the Creative Commons Attribution License 4.0 (CCBY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. http://creativecommons.org/licenses/by/4.0

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Histopathological examination of the surgical specimen. (A) Histopathological examination of the surgical specimen revealed a schwannoma, composed of compact areas of spindle cells (Antoni A, arrowheads) and loosely arranged foci (Antoni B, asterisk). (B) A small calcification and ossification (arrow) were observed. (C) Immunohistochemistry shows positive staining for the S-100 protein, confirming the diagnosis of schwannoma. (D) In this Masson trichrome-stained section, collagen deposition was revealed as blue areas.