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. 2022 Mar 21;16(1):168–178. doi: 10.1007/s12105-022-01416-x

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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/.

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Fig. 1 — Representative examples of SMARCB1-deficient sinonasal carcinoma. A basaloid (dark-stained) monomorphic cells replacing the surface epithelium and showing extensive downgrowth along preexisting glands resulting in combined exophytic-endophytic papillary pattern at low-power. B monomorphic basaloid cell morphology with prominent stromal desmoplasia. C numerous rhabdoid cells are interspersed among undifferentiated basaloid cells. D replacement of the surface mucosa by tumor tissue mimicking carcinoma in situ. E partial downgrowth along deeper respiratory glands. F complete loss of SMARCB1 is definitional for these tumors