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. 2026 Jun 4;13(4):e200604. doi: 10.1212/NXI.0000000000200604

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Copyright © 2026 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Neurology.

This is an open access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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(A) MRI September 2024: axial T2/FLAIR image demonstrates right frontoparietal hyperintensity related to vasogenic edema. (B) MRI September 2024: sagittal T1 postcontrast image demonstrates parasagittal frontoparietal leptomeningeal enhancement. (C) MRI February 2025: axial FLAIR image demonstrates slight anterior extension of right frontoparietal edema with improved edema posteriorly. (D) MRI February 2025: sagittal T1 postcontrast image shows worsening or more diffuse right frontoparietal leptomeningeal enhancement in the parasagittal sulci.