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. 2020 Jan 17;10:575. doi: 10.1038/s41598-019-57046-x

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© The Author(s) 2020

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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T2-weighted MRIs. Accurate apical localization requires use of the coronal plane. The apex, as defined as the inferior boundary of the peripheral zone (PZ) is located in the coronal plane (+on left image) to simultaneously establish the correct level of the apex in the mid-sagittal plane (+sign in right image).