Objective To explore the feasibility of preoperative visualization and localization of facial nerve by diffusion tensor imaging( DTI) in large vestibular schwannoma for facial nerve sparing. Methods 23 patients with unilateral vestibular schwannoma( extrameatal diameter ≥3. 0cm) were included in this study. Visualization and identification of facial nerves with DTI were performed in each case preoperatively,and the results were validated by intraoperative inspecting and electrophysiological monitoring. Func...