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Case 8. (A) FLAIR images fail to reveal epileptogenic cortical lesion, while sporadic subcortical hyperintensities are noted. (B) On ASL with a PLD of 1.5 s, increased signals are noted on the bilateral frontal lobe, especially on the interhemispheric surfaces. (C) At ASL with a PLD 2.5 of seconds, further increased signals are observed. (D) Subsequent EEG demonstrates subclinical seizure activities on the right fronto-central region (black lines).
