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. 2020 Jul 20;8:115. doi: 10.1186/s40478-020-00998-3

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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. 1 — High left frontal tumor with two radiologically distinct components on preoperative axial T1-weighted (a), T2-weighted (b), FLAIR and coronal T2-weighted (d) MR images. A medial T1-hypointense T2-hyperintense component (asterisk) centered in the superior frontal gyrus shows well defined margins and the “T2-FLAIR” mismatch sign indicative of IDH1 mutant 1p/19q non-codeleted astrocytoma. A contiguous more lateral component (arrowheads) centered in the middle frontal gyrus shows less well-defined margins with cortical infiltration and gyral expansion more typical of oligodendroglioma. Follow-up axial T2-weighted imaging after resection of the more medial component (e) and the more lateral component (f)