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. 2019 Oct 22;20:381. doi: 10.1186/s12882-019-1580-y

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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. 1 — Pathological tonsillar findings in this patient. a The lymphoid follicles and germinal centers had various sizes. The boundary of each follicle was unclear and the expansion of the distance between follicles was observed. b CD4 staining showed T-cell nodules were enlarged by infiltration of CD4⁺ cells (allow). c Cytokeratin staining showed abnormal reticulation of the crypt epithelium (arrow)