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. 2023 Apr 26;10:1132450. doi: 10.3389/fsurg.2023.1132450

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© 2023 Xie, Wu, Cui, Zeng, Chen, Liang, Lu, Zhang and Jiang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Endoscopic view (70° rigid nasal endoscope) of patients 1, 2 and 3 after operation: patient 1 (A, B), patient 2 (C, D), patient 3 (E, F), left (A, C, E) and right (B, D, F). The arrow indicates the opening of the frontal sinus.