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Figure 1. Preoperative Diffusion Tensor Tractography in a patient with unilateral facial nerve schwannoma, showing the course of the facial nerve along the anterior middle third of the tumor. (A-C) The axial, coronal, and sagittal view of diffusion tensor tractography showing the facial nerve tract (yellow arrow), the tumor (T) and the contralateral normal facial nerve tract (blue arrow). (D) The three-dimensional model of the facial nerve tract (yellow arrow), the tumor (T) and the contralateral normal facial nerve tract (blue arrow). L: left; R: right. With permission from Chen et al.^[18].