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. 2021 Jun 4;2021(6):rjab220. doi: 10.1093/jscr/rjab220

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Published by Oxford University Press and JSCR Publishing Ltd. © The Author(s) 2021.

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

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Case 1: macroscopic and microscopic features of extragastrointestinal stromal tumor. (a) Macroscopic appearance of tumor. (b) Low-power view. Tumor cells are arranged in fascicles. H & E stain. Original magnification ×100. (c) High-power view. The tumor cells have scant to moderate amount of cytoplasm. Nuclei are oval to elongated and have coarse nuclear chromatin. Mitosis is also noted (arrow). H & E stain. Original magnification ×400. (d) Low-power view. IHC showing diffuse staining by CD 117. Original magnification ×100. (e) High-power view. IHC showing diffuse cytoplasmic staining by CD 117. Original magnification ×400.