Abstract
Objectives
Diffuse midline gliomas, H3K27-altered (DMG-A), are malignant gliomas with an unfavorable prognosis. Knowledge of dynamic susceptibility contrast (DSC) MRI findings and imaging differences with high-grade midline glioma without H3K27 alteration (DMG-W) has been limited. We compared the DSC, ADC, and conventional MRI findings between DMG-A and DMG-W.
Methods
In this single institutional retrospective study, the electronic database of our hospital between June 2015 and May 2021 was searched. Twenty and 17 patients with DMG-A (median, 13 years; range, 3–52 years; 11 females) and DMG-W (median, 40 years; 7–73 years; 9 females), respectively, were found. Normalized relative cerebral blood flow (nrCBF) and normalized corrected relative cerebral blood volume (ncrCBV); normalized maximum, mean, and minimum ADC values; and the prevalence of T2-FLAIR mismatch sign were compared between the two groups using Mann–Whitney U tests and Fisher’s exact test.
Results
The nrCBF and ncrCBV were significantly lower in DMG-A compared with DMG-W (nrCBF: median 0.88 [range, 0.19–2.67] vs. 1.47 [range, 0.57–4.90] (p < 0.001); ncrCBV: 1.17 [0.20–2.67] vs. 1.56 [0.60–4.03] (p = 0.008)). Normalized maximum ADC (nADCmax) was significantly higher in DMG-A (median 2.37 [1.25–3.98] vs. 1.95 [1.23–2.77], p = 0.02). T2-FLAIR mismatch sign was significantly more common in DMG-A (11/20 (55.0%) vs. 1/17 (5.9%), p = 0.0017). When at least two of nrCBF < 1.11, nADCmax ≥ 2.48, and T2-FLAIR mismatch sign were positive, the diagnostic performance was the highest with accuracy of 0.81.
Conclusion
DSC-MRI parameters, ADC values, and the T2-FLAIR mismatch sign are useful to differentiate between DMG-A and DMG-W.
Key Points
• Diffuse midline glioma, H3K27-altered (DMG-A), showed a significantly lower normalized relative cerebral blood flow and volume compared with H3K27-wild-type counterparts (DMG-W).
• T2-fluid-attenuated inversion recovery (FLAIR) mismatch sign was significantly more frequent in DMG-A compared to DMG-W.
• Indicators that combined DSC parameters, ADC values, and T2-FLAIR mismatch sign, with or without age, are useful to distinguish the two tumors.
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Abbreviations
- AIF:
-
Arterial input function
- DMG-A:
-
Diffuse midline glioma, H3K27-altered
- DMG-W:
-
Midline high-grade glioma without H3K27 alteration
- DSC:
-
Dynamic susceptibility contrast
- nADCmax /mean/min :
-
Normalized maximum/mean/minimum ADC
- ncrCBV:
-
Normalized corrected relative cerebral blood volume
- nrCBF:
-
Normalized relative cerebral blood flow
- ROI:
-
Region-of-interest
- WHO:
-
World Health Organization
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Acknowledgements
The authors thank Ms. Nancy Dudek, an MRI Technologist at University of Michigan Health System, for her technical support. The authors thank Dr. Takeru Q Suyama at National Institute of Informatics, for his advice on statistics.
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The scientific guarantor of this publication is Toshio Moritani, Division of Neuroradiology, Department of Radiology, Michigan Medicine, 1500E Medical Center Drive Ann Arbor, MI 48109, United States.
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Kurokawa, R., Kurokawa, M., Baba, A. et al. Dynamic susceptibility contrast-MRI parameters, ADC values, and the T2-FLAIR mismatch sign are useful to differentiate between H3-mutant and H3-wild-type high-grade midline glioma. Eur Radiol 32, 3672–3682 (2022). https://doi.org/10.1007/s00330-021-08476-7
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DOI: https://doi.org/10.1007/s00330-021-08476-7