Beyond T2-FLAIR mismatch sign in isocitrate dehydrogenase mutant 1p19q non-codeleted astrocytoma: Analysis of tumor core and evolution with multiparametric magnetic resonance imaging.
Author
Jen, Jian PingLi, Xuanxuan
Patel, Markand
Haq, Huzaifah
Pohl, Ute
Nagaraju, Santhosh
Wykes, Victoria
Sanghera, Paul
Watts, Colin
Sawlani, Vijay
Publication date
2024-07-18
Metadata
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Background: The T2-FLAIR mismatch sign is an imaging correlate for isocitrate dehydrogenase (IDH)-mutant 1p19q non-codeleted astrocytomas. However, it is only seen in a part of the cases at certain stages. Many of the tumors likely lose T2 homogeneity as they grow in size, and become heterogenous. The aim of this study was to investigate the timecourse of T2-FLAIR mismatch sign, and assess intratumoral heterogeneity using multiparametric magnetic resonance imaging techniques. Methods: A total of 128 IDH-mutant gliomas were retrospectively analyzed. Observers blinded to molecular status used strict criteria to select T2-FLAIR mismatch astrocytomas. Pre-biopsy and follow-up standard structural sequences of T2, FLAIR and apparent diffusion coefficient, MR spectroscopy (both single- and multi-voxel techniques), and DSC perfusion were observed. Results: Nine T2-FLAIR mismatch astrocytomas were identified. 7 had MR spectroscopy and perfusion data. The smallest astrocytomas began as rounded T2 homogeneous lesions without FLAIR suppression, and developed T2-FLAIR mismatch during follow-up with falls in NAA and raised Cho/Cr ratio. Larger tumors at baseline with T2-FLAIR mismatch signs developed intratumoral heterogeneity, and showed elevated Cho/Cr ratio and raised relative cerebral blood volume (rCBV). The highest levels of intratumoral Cho/Cr and rCBV changes were located within the tumor core, and this area signifies the progression of the tumors toward high grade. Conclusions: T2-FLAIR mismatch sign is seen at a specific stage in the development of astrocytoma. By assessing the subsequent heterogeneity, MR spectroscopy and perfusion imaging are able to predict the progression of the tumor towards high grade, thereby can assist targeting for biopsy and selective debulking. Keywords: 1p19q non-codeleted astrocytoma; IDH mutant; T2-FLAIR mismatch; intratumoral heterogeneity; spectroscopy.Citation
Jen JP, Li X, Patel M, Haq H, Pohl U, Nagaraju S, Wykes V, Sanghera P, Watts C, Sawlani V. Beyond T2-FLAIR mismatch sign in isocitrate dehydrogenase mutant 1p19q non-codeleted astrocytoma: Analysis of tumor core and evolution with multiparametric magnetic resonance imaging. Neurooncol Adv. 2024 Jul 18;6(1):vdae065. doi: 10.1093/noajnl/vdae065. PMID: 39071736; PMCID: PMC11275453.Type
ArticlePMID
39071736Journal
Neuro-Oncology AdvancesPublisher
Oxford University Pressae974a485f413a2113503eed53cd6c53
10.1093/noajnl/vdae065