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Cortical lesions not apparent on DIR: T1-weighted (A), FLAIR (B), and DIR (C). CLs affecting the cortex are marked with a red square and zoomed. Note the clear hypointense signal on the T1-weighted image and the clear hyperintense signal on FLAIR images. The lesion is less evident on DIR because it is only slightly hyperintense compared with surrounding cortex, possibly due to greater partial volume effects than in FLAIR.
