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Retrosigmoid Approach

Last Updated: September 30, 2018

Resection of a Large Acoustic Neuroma through the Retrosigmoid Approach: Saving the Face

Vestibular schwannomas (VSs), also called acoustic neuromas, account for 8% to 10% of intracranial neoplasms. More specifically, they account for more than 80% of the cerebellopontine (CP) angle tumors, making them the most common tumor in this location. Most VSs arise from one of the vestibular nerves, most commonly from the superior one.

VSs are slow-growing benign neoplasms arising from the transition zone between the central and peripheral myelin, a point of origin typically found in the medial aspect of the internal auditory canal (IAC), approximately 8 to 12 mm from the pial surface of the pons. As they grow, VSs typically cause dysfunction of cranial nerve (CN) VIII, followed by dysfunction...