J Neurol Surg B Skull Base 2023; 84(03): 296-306
DOI: 10.1055/a-1808-1359
Original Article

Endoscopic Endonasal Approach to the Third Ventricle Using the Surgical Corridor of the Reverse Third Ventriculostomy: Anatomo-Surgical Nuances

Ali Karadag
1   Department of Neurosurgery, Health Science University, Tepecik Research and Training Hospital, Izmir, Turkey
2   Microsurgical Neuroanatomy Laboratory, Department of Neurosurgery, Cerrahpasa Medical Faculty, Istanbul University–Cerrahpasa, Istanbul, Turkey
,
Mahmut Camlar
1   Department of Neurosurgery, Health Science University, Tepecik Research and Training Hospital, Izmir, Turkey
,
Omer Furkan Turkis
2   Microsurgical Neuroanatomy Laboratory, Department of Neurosurgery, Cerrahpasa Medical Faculty, Istanbul University–Cerrahpasa, Istanbul, Turkey
3   Department of Neurosurgery, Health Science University, Van Research and Training Hospital, Van, Turkey
,
Nijat Bayramli
1   Department of Neurosurgery, Health Science University, Tepecik Research and Training Hospital, Izmir, Turkey
2   Microsurgical Neuroanatomy Laboratory, Department of Neurosurgery, Cerrahpasa Medical Faculty, Istanbul University–Cerrahpasa, Istanbul, Turkey
,
Erik H. Middlebrooks
4   Departments of Neurosurgery and Radiology, Mayo Clinic, Jacksonville, Florida, United States
,
Necmettin Tanriover
2   Microsurgical Neuroanatomy Laboratory, Department of Neurosurgery, Cerrahpasa Medical Faculty, Istanbul University–Cerrahpasa, Istanbul, Turkey
5   Department of Neurosurgery, Cerrahpasa Faculty of Medicine, Istanbul University–Cerrahpasa, Istanbul, Turkey
› Author Affiliations
Preview

Abstract

Objective Surgical access to the third ventricle can be achieved through various corridors depending on the location and extent of the lesion; however, traditional transcranial approaches risk damage to multiple critical neural structures.

Methods Endonasal approach similar to corridor of the reverse third ventriculostomy (ERTV) was surgically simulated in eight cadaveric heads. Fiber dissections were additionally performed within the third ventricle along the endoscopic route. Additionally, we present a case of ERTV in a patient with craniopharyngioma extending into the third ventricle.

Results The ERTV allowed adequate intraventricular visualization along the third ventricle. The extracranial step of the surgical corridor included a bony window in the sellar floor, tuberculum sella, and the lower part of the planum sphenoidale. ERTV provided an intraventricular surgical field along the foramen of Monro to expose an area bordered by the fornix anteriorly, thalamus laterally, anterior commissure anterior superiorly, posterior commissure, habenula and pineal gland posteriorly, and aqueduct of Sylvius centered posterior inferiorly.

Conclusion The third ventricle can safely be accessed through ERTV either above or below the pituitary gland. ERTV provides a wide exposure of the third ventricle through the tuber cinereum and offers access to the anterior part as far as the anterior commissure and precommissural part of fornix and the whole length of the posterior part. Endoscopic ERTV may be a suitable alternative to transcranial approaches to access the third ventricle in selected patients.



Publication History

Received: 10 October 2021

Accepted: 18 March 2022

Accepted Manuscript online:
24 March 2022

Article published online:
06 July 2022

© 2022. Thieme. All rights reserved.

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany