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. 2021 Mar 2;11:4993. doi: 10.1038/s41598-021-83905-7

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© The Author(s) 2021

Open Access This 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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If the tumor invades the optic canal, the optic canal should be fully opened. (A) Preoperative coronal MRI showed that the tumor had invaded the left optic canal (white arrow). (B) The left optic canal (yellow wire frame) was fully exposed intraoperatively. (C) Showing tumors in the optic canal (yellow solid line arrow) (D) After the tumor had been removed completely (yellow solid line arrow showed that the tumor in the optic canal had been removed), the optic nerve and its blood-supplying vessels were well protected.