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MRI of the brain obtained on day 5 of admission. A-C. Axial pre-contrast FLAIR (A), DWI (B) and post-contrast T1-weighted (C) MRI demonstrate a small FLAIR hyperintense lesion (white arrows) with low diffusivity and faint enhancement in the left thalamus (noting incidental adjacent developmental venous anomaly, arrowhead in C). D. Axial postcontrast FLAIR demonstrates diffuse leptomeningeal enhancement (black arrows) that was not apparent on the post-contrast T1-weighted images
