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. 2021 Oct 30;17:343. doi: 10.1186/s12917-021-03048-9

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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/. 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 — Left sinonasal endoscopic views. a Polypoid mucosal swelling (arrow) of caudodorsomedial ventral conchal (VC) aspects. Endoscope is located in the middle nasal meatus laying dorsal on the VC looking caudal. b Polypoid mucosal swelling (arrow) of dorsolateral VC aspects near the rostral nasomaxillary aperture, which shows draining purulent secretions (asterisk). The endoscope was guided towards the left lateral wall of the nasal cavity (L). c Advancing the endoscope further into the aperture clarified origin of purulent secretions (asterisk) from the rostral maxillary sinus, which was not accessible due to mucosal swelling. d At the level of entrance to the VC recess (arrow), masses of isolated necrotic conchal bone and impacted pus (asterisk) are visible. The VC recess was not accessible endoscopically. Dorsal concha, DC. e Caudomedial aspects of the deformed VC showing inflamed, partially necrotic, areas with purulent deposits (asterisk). Nasal septum, NS. f VC sinus reached via a large necrotic defect in middle medial aspect of the VC. Isolated necrotic conchal bone an pus (arrows) hindered passage into the rostral maxillary sinus