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. 2022 Dec 21;22:325. doi: 10.1186/s12902-022-01220-2

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 4 — Electron microscopy revealed the adenoma cells were Plurimorphous. Ultrastructural examination identified that some adenoma cells were densely granulated, and secretory granules were spherical or ovoid and measured 300–450 nm (black arrow). The thyrotropin cells were a predominantly spherical or ovoid nucleus, Scattered lysosomes and mitochondria, prominent Golgi apparatus, and numerous secretory granules measuring 100 to 200 nm (red arrow)