fig2

Figure 2. Preoperative magnetic resonance image and perfusion CT. No acute cerebral ischemic lesion on preoperative FLAIR (A), DWI (B), perfusion CT revealed mild reduced CBF (C), and CBV (D) along with increased MTT (E) and TTP (F) at left frontal lobe (white arrow). 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