fig3

Figure 3. Postoperative magnetic resonance image and perfusion CT. MR image at postoperative Day 6 revealed a ischemic lesion (white arrow) of hyperintensity between the right parietal and occipital lobe on FLAIR (A) and DWI (B). Perfusion CT at postoperative Day 3 showed CBF (C) and CBV (D) reduced at the corresponding site. Regional MTT (E) and TTP (F) increased significantly. CT: computed tomography; CBF: cerebral blood flow; CBV: cerebral blood volume; DWI: diffusion weighted image; FLAIR: fluid attenuated inversion recovery; MTT: mean transit time; TTP: time to peak