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. 2022 Jun 22;22:242. doi: 10.1186/s12890-022-02034-7

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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. 2 — Cytology of pericardial fluid (Papanicolaou stain, × 400) (a) and histology of a biopsy specimen (Hematoxylin and eosin stain, × 200) (b). a Pericardial fluid showing an aggregate of atypical cells and inflammatory cells (mainly neutrophils). Atypical cells contain large nuclei with poor chromatin enrichment, relatively prominent nucleoli and abundant cytoplasm. b Spindle-shaped and oval epithelial cells with low-grade dysplasia arranged in pseudo-rosettes or short fascicles admixed with few lymphocytes. The sections were observed with a microscope: BX53 (OLYMPUS, Tokyo, Japan), lenses: UPlanFl (OLYMPUS, Tokyo, Japan), a camera: DP22 (OLYMPUS, Tokyo Japan), and a photo system: cellSens Standard 2.3 (OLYMPUS, Tokyo Japan) at a resolution of 96 dots per inch (1920 × 1440 pixels). The scale bar is 50 μm (a) or 100 μm (b)