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. 2020 May 20;20:200. doi: 10.1186/s12883-020-01783-4

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© The Author(s) 2020

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. 4 — Radiological imaging of the tumor deriving from the arachnoid architecture within the velum interpositum. a-c: Preoperative images showing a pineal region meningioma. d-f: Postoperative images showing gross-total removal of the tumor. g: Schematic representation of the microanatomical relationship between the tumor origin and arachnoid membranes. (Yellow lines represent the arachnoid membrane; Red line represent possible tumor attachment)