Drilling technique of the internal auditory canal in vestibular schwannoma surgery assisted by neuronavigated autofocus microscope

The IAC drilling, performed under the assistance of a neuronavigation-integrated autofocus microscope, provides a tailored anatomy-guided approach. This technique facilitates individualized exposure of the intrameatal tumour component while supporting the preservation of critical intraosseous petrous structures. By continuously adapting the drilling trajectory to the patient's specific anatomy, it enables a controlled removal of the IAC posterior wall and may contribute to reducing the risk of unintended structural injury.