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Gustavo S. Jung, Joel Fernando Sanabria Duarte, Afonso H. de Aragão, Ronaldo Pereira Vosgerau, and Ricardo Ramina

The course of the facial nerve (FN) has been extensively investigated in patients with vestibular schwannomas (VSs). FN running dorsally to the tumor capsule accounts for less than 3% of the cases. Diffusion tensor imaging (DTI)–based fiber tracking helps to preoperatively identify the FN. During surgery, a higher risk of injury is associated with the dorsal location of the FN. The authors demonstrate the nuances and tricks to identify and preserve a dorsal displaced FN during resection of a large VS, T3b according to the Hannover classification, through the retrosigmoid-transmeatal approach.

The video can be found here: https://stream.cadmore.media/r10.3171/2021.7.FOCVID2182