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Pediatric-type diffuse low-grade glioma with T2-FLAIR mismatch sign: a case report and literature review

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Abstract

Introduction

Pediatric-type diffuse low-grade gliomas are a new entity that was introduced in the fifth edition of the World Health Organization Classification of Tumors of the Central Nervous System, which was published in 2021. Notably, the information regarding the radiophenotypes of this new entity is limited.

Objective

T2-FLAIR mismatch sign has been mostly studied in adult-type diffuse gliomas so far. We aimed to present more pediatric cases for future research about T2-FLAIR mismatch signs in pediatric-type diffuse low-grade gliomas.

Case presentation

The current study presents a case of a 2-year-old boy who has a subcortical tumor at the right precentral frontal region. This tumor exhibited a T2-fluid-attenuated inversion recovery (FLAIR) mismatch sign that was identified as specific for isocitrate dehydrogenase (IDH)-mutant 1p/19q non-co-deleted astrocytomas. The tumor was pathologically identified as pediatric-type diffuse low-grade gliomas, and it tested negative for IDH-1 immunohistochemistry. The whole-exome sequencing of tumor tissue revealed negative results for IDH mutation, 1p/19q co-deletion, MYB rearrangement, and all other potential pathogenic mutations.

Conclusion

The T2-FLAIR mismatch sign may not be 100% specific for IDH-mutant gliomas, especially in children, and researchers must further investigate the pathophysiology of the T2-FLAIR mismatch sign in brain tumors and the radiophenotypes of entities of pediatric brain tumors.

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Data availability

No datasets were generated or analyzed during the current study.

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Acknowledgements

We would like to acknowledge Professor Ni-Chung Lee (of the Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan) for whole exome sequencing data analysis.

Funding

No funding was obtained for this study.

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Authors and Affiliations

Authors

Contributions

Jia-Ching Hwa: conceptualization and writing-original draft. Alex Mun-Ching Wong: methodology. Shih-Ming Jung: methodology, review, and editing. Chieh-Tsai Wu: review, editing, and supervision. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Chieh-Tsai Wu.

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In this case report, the authors declare that they follow the regulations approved by the Chang Gung Medical Foundation Institutional Review Board (202201568B0) and the Helsinki Declaration of the World Medication Association. Informed consent was obtained from the patient’s parents.

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The authors declare that they have no competing interests.

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Hwa, JC., Wong, A.MC., Jung, SM. et al. Pediatric-type diffuse low-grade glioma with T2-FLAIR mismatch sign: a case report and literature review. Childs Nerv Syst (2024). https://doi.org/10.1007/s00381-024-06487-5

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