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. 2023 Jan 4;11(1):E3–E10. doi: 10.1055/a-1968-7501

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The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.

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Fig. 2 a — A superficial hypopharyngeal cancer measuring 30 mm in diameter was located in the left pyriform sinus adjacent to the hyoid bone. b Marking was performed with the tip of SOUTEN. c The subepithelial layer was dissected with the tip of SOUTEN. d The ulcer floor after endoscopic submucosal dissection. e The specimen resected en bloc. f Histological examination confirmed the diagnosis of squamous cell carcinoma with subepithelial invasion (tumor thickness 560 μm).