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. 2021 Sep 24;279(1):299–310. doi: 10.1007/s00405-021-07076-x

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© The Author(s) 2021

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 — Clinical endoscopic pictures of cases of non-SCC. A1 Fusiform cell rhabdomyosarcoma white light appearance; A2 fusiform cell rhabdomyosarcoma narrow band imaging appearance; B1 Kaposi sarcoma white light appearance; B2 Kaposi sarcoma narrow band imaging appearance; C1 chondroma white light appearance; C2 chondroma narrow band imaging appearance; D1 non-small cell neuroendocrine carcinoma white light appearance; D2 non-small cell neuroendocrine carcinoma narrow band imaging appearance