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Microendoscopy of the internal auditory canal in vestibular schwannoma surgery
M Tatagiba1, C Matthies, M Samii
1Neurosurgery Department, Nordstadt Hospital, Hannover, Germany.
Abstract:
Intraoperative microendoscopy was performed for eight patients to access the fundus of the internal auditory canal after retrosigmoid transmeatal surgery of vestibular schwannomas. The transmeatal procedure is usually limited laterally by the labyrinth block. The restricted opening of the internal auditory canal bears a potential risk of incomplete tumor resection. For eight patients with vestibular schwannomas, intraoperative microendoscopy was performed after tumor resection to expose the "blind" area of the internal auditory canal fundus. An excellent view of the fundus contents was obtained, including Cranial Nerves VII and VIII and the crista transversa. Tumor remnants were not observed in this series. Microendoscopy was shown to be an ideal adjunct to hearing-preserving transmeatal surgery of vestibular schwannomas, enabling the removal of intracanalicular tumors with direct control of the lateral intracanalicular nerve portions.
Insights
Intraoperative microendoscopy improved visualization of the internal auditory canal fundus after vestibular schwannoma surgery. This technique helped ensure complete tumor removal and protected cranial nerves VII and VIII.
Area of Science:
- Neurosurgery
- Otolaryngology
- Surgical Oncology
Background:
- Retrosigmoid transmeatal surgery for vestibular schwannomas can have limited visualization of the internal auditory canal fundus.
- This limited view poses a risk of incomplete tumor resection.
- Cranial nerves VII and VIII are at risk during tumor removal.
Purpose of the Study:
- To evaluate the utility of intraoperative microendoscopy in accessing the internal auditory canal fundus after vestibular schwannoma resection.
- To assess the effectiveness of microendoscopy in identifying tumor remnants and critical neurovascular structures.
Main Methods:
- Intraoperative microendoscopy was performed in eight patients following retrosigmoid transmeatal vestibular schwannoma resection.
- The procedure focused on visualizing the fundus of the internal auditory canal, including the area typically obscured ('blind spot').
Main Results:
- Microendoscopy provided an excellent view of the internal auditory canal fundus contents.
- Key structures visualized included Cranial Nerves VII and VIII and the crista transversa.
- No tumor remnants were detected in any of the patients in this series.
Conclusions:
- Intraoperative microendoscopy is a valuable adjunct to hearing-preserving transmeatal surgery for vestibular schwannomas.
- It enables direct visualization and control of the lateral intracanalicular nerve portions, aiding complete tumor resection.