Fig. 1

Seventy-four-year-old man with 70 % stenosis of left ICA. Preoperative (a) FLAIR and DWI (b) images show no abnormality. Postoperative FLAIR (c) and DWI (d) images demonstrate new left parietal small acute ischemic lesion (white arrow) which is not seen on preoperative images (a, b)