Fig. 3. 87-year-old man with right lower extremity weakness.

A. Initial brain MRI shows focal linear contrast enhancement at both of inferior occipital sulci (arrows) on postcontrast FLAIR image, which is early hyperintense acute reperfusion marker sign. B. There is no evidence of acute infarction on diffusion-weighted image. C, D. Contrast is still present in cerebrospinal fluid space from previous images performed 23 hours prior on first follow-up FLAIR images, which is feature of classic HARM. E, F. Second follow-up MRI obtained 48 h after initial MRI shows no contrast present on FLAIR images. FLAIR = fluid attenuated inversion recovery