The Experts below are selected from a list of 87 Experts worldwide ranked by ideXlab platform

Laszlo Solymosi - One of the best experts on this subject based on the ideXlab platform.

  • Posterior Inferior cerebellar artery aneurysm in the fourth ventricle
    Neuroradiology, 1995
    Co-Authors: Horst Urbach, C. Cedzich, Bernhard Meyer, Laszlo Solymosi
    Abstract:

    We report a patient with a ruptured aneurysm of the choroidal branch of the right posterior Inferior cerebellar artery (PICA), lying in and causing an isolated haemorrhage in the fourth ventricle. MRI on the first day after bleeding revealed an abnormal vessel in the fourth ventricle, which was surrounded by a mass of intermediate signal on T1- and T2-weighted images. The aneurysm was clipped via partial splitting of the lower vermis and opening the Inferior Medullary Velum. A postoperative angiogram confirmed complete obliteration of the aneurysm. With PICA aneurysms the rate of intraventricular haemorrhage is high and in most cases due to reflux of blood. It there is an isolated intraventricular haemorrhage, a peripheral PICA aneurysm, lying in or near the fourth ventricle, may be suspected.

Aaron A. Cohen-gadol - One of the best experts on this subject based on the ideXlab platform.

  • The Inferior Medullary Velum: anatomical study and neurosurgical relevance.
    Journal of neurosurgery, 2012
    Co-Authors: R. Shane Tubbs, Anand N. Bosmia, Marios Loukas, Eyas M. Hattab, Aaron A. Cohen-gadol
    Abstract:

    Object Although it is often visualized surgically, details regarding the Inferior Medullary Velum are lacking in the literature. The present study is intended to better elucidate this neuroanatomical structure using microsurgical and immunohistochemical analyses. Methods To study the Inferior Medullary Velum, the authors performed microdissection in 15 adult cadavers. Following gross study, specimens were examined histologically. Results The Inferior Medullary Velum extended from the flocculus to the middle cerebellar peduncle and stretched between the Inferior cerebellar peduncle and the nodule and pyramid. The average thickness of the Velum was found to be 0.5 mm (range 0.35–0.8 mm) and the average length was found to be 6 mm (range 5.5–7.2 mm). Arterial branches were identified in all specimens that arose from Medullary branches of the posterior Inferior cerebellar artery and supplied the Inferior Medullary Velum. Histologically and from internal to external, a choroid plexus epithelium as a single cel...

Vincent N. Dodson - One of the best experts on this subject based on the ideXlab platform.

  • Telovelar approach for microsurgical resection of fourth ventricular subependymoma arising from rhomboid fossa: operative video and technical nuances
    Neurosurgical Focus: Video, 2019
    Co-Authors: James K. Liu, Vincent N. Dodson
    Abstract:

    Fourth ventricular tumors have traditionally been removed via transvermian approaches, which can result in potential dysequilibrium and mutism. The telovelar approach is an excellent alternative to widely expose fourth ventricular tumors without transgressing the cerebellar vermis. This is achieved by opening the cerebelloMedullary fissure and incising the tela choroidea and Inferior Medullary Velum, which form the lower half of the roof of the fourth ventricle. In this operative video manuscript, the authors demonstrate microsurgical resection of a fourth ventricular subependymoma arising from the rhomboid fossa via the telovelar approach. The key technical nuance in this video is to demonstrate a gentle and safe technique to identify a dissectable plane to peel the tumor off of the rhomboid fossa using a microspreading technique with fine micro-bayonetted forceps. A gross-total resection was achieved, and the patient was neurologically intact.The video can be found here: https://youtu.be/ZEHHbUGb9zk.

Horst Urbach - One of the best experts on this subject based on the ideXlab platform.

  • Posterior Inferior cerebellar artery aneurysm in the fourth ventricle
    Neuroradiology, 1995
    Co-Authors: Horst Urbach, C. Cedzich, Bernhard Meyer, Laszlo Solymosi
    Abstract:

    We report a patient with a ruptured aneurysm of the choroidal branch of the right posterior Inferior cerebellar artery (PICA), lying in and causing an isolated haemorrhage in the fourth ventricle. MRI on the first day after bleeding revealed an abnormal vessel in the fourth ventricle, which was surrounded by a mass of intermediate signal on T1- and T2-weighted images. The aneurysm was clipped via partial splitting of the lower vermis and opening the Inferior Medullary Velum. A postoperative angiogram confirmed complete obliteration of the aneurysm. With PICA aneurysms the rate of intraventricular haemorrhage is high and in most cases due to reflux of blood. It there is an isolated intraventricular haemorrhage, a peripheral PICA aneurysm, lying in or near the fourth ventricle, may be suspected.

Albert L. Rhoton - One of the best experts on this subject based on the ideXlab platform.

  • telovelar approach to the fourth ventricle microsurgical anatomy
    Journal of Neurosurgery, 2000
    Co-Authors: Antonio C M Mussi, Albert L. Rhoton
    Abstract:

    Object. In the past, access to the fourth ventricle was obtained by splitting the vermis or removing part of the cerebellum. The purpose of this study was to examine the access to the fourth ventricle achieved by opening the tela choroidea and Inferior Medullary Velum, the two thin sheets of tissue that form the lower half of the roof of the fourth ventricle, without incising or removing part of the cerebellum. Methods. Fifty formalin-fixed specimens, in which the arteries were perfused with red silicone and the veins with blue silicone, provided the material for this study. The dissections were performed in a stepwise manner to simulate the exposure that can be obtained by retracting the cerebellar tonsils and opening the tela choroidea and Inferior Medullary Velum. Conclusions. Gently displacing the tonsils laterally exposes both the tela choroidea and the Inferior Medullary Velum. Opening the tela provides access to the floor and body of the ventricle from the aqueduct to the obex. The additional openi...