CC BY-NC-ND 4.0 · J Neurol Surg B 2018; 79(S 05): S413-S414
DOI: 10.1055/s-0038-1669978
Skull Base: Operative Videos
Georg Thieme Verlag KG Stuttgart · New York

Endoscopic Assisted Retrosigmoid Approach for Cerebellopontine Angle Epidermoid Tumor

Katherine Kunigelis
1  Department of Neurosurgery, University of Colorado, Aurora, Colorado, United States
,
Alexander Yang
1  Department of Neurosurgery, University of Colorado, Aurora, Colorado, United States
,
A. Samy Youssef
1  Department of Neurosurgery, University of Colorado, Aurora, Colorado, United States
› Author Affiliations
Further Information

Publication History

01 May 2018

12 August 2018

Publication Date:
25 September 2018 (eFirst)

  

Abstract

This case is a 20-year-old male, who presented with 1 month of right facial weakness (HB4) and complaints of ipsilateral eye dryness. He was initially treated for Bell's palsy with steroids and antiviral agents, but subsequently developed diplopia with right lateral gaze and underwent an MRI (magnetic resonance imaging). MRI demonstrated a 4.5 cm irregular lesion in the right cerebellopontine angle consistent with an epidermoid cyst. Because the tumor had grown with the development of the central nervous system, it has extended into different compartments, including the tentorial incisura and pineal region. A predefined surgical corridor created by the tumor facilitated access to the majority of the tumor through a retrosigmoid approach. Angled endoscopes (30-degree up and down) provided further visualization of tumor away from the line of sight of the microscope, thus allowing for gross total resection of the lesion. This video also demonstrates a sharp dissection technique necessary for safe removal of adherent tumor from critical neurovascular structures, including the basilar artery and several cranial nerves. The ipsilateral auditory evoked responses (ABRs) showed slight improvement from baseline toward the end of the case. A gross total resection was achieved, as shown by the MRI. The patient remained at his baseline cranial nerve (CN) V, VII, and VIII deficits during the immediate postoperative period.

The link to the video can be found at: https://youtu.be/vCq5juJh8hk.