The Experts below are selected from a list of 7167 Experts worldwide ranked by ideXlab platform
M. Osame - One of the best experts on this subject based on the ideXlab platform.
-
Magnetic resonance tomographic angiography: diagnostic value in trigeminal neuralgia
Neuroradiology, 1995Co-Authors: F. Umchara, K. Kamishima, N. Kashio, K. Yamaguchi, T. Sakimoto, M. OsameAbstract:A combination of MRI, MR angiography and MR tomographic angiography (MRTA) was used to study the relationship to the root Exit Zone of the trigeminal nerve to surrounding vascular structures in seven patients with trigeminal neuralgia (TN) and ten patients with no evidence at a lesion in this region. MRTA is the technique for showing the relationship between vessels, cranial nerves and brain stem. MRTA clearly demonstrated the presence of a vessel at the root Exit Zone of the trigeminal nerve in all patients with TN. In the ten other patients, examination of 20 trigeminal nerves revealed that only one nerve (5%) was in contact with a vessel at the root Exit Zone. This study supports vascular compression of trigeminal nerves as a cause of TN, and demonstrates the value of MRTA as noninvasive technique for demonstrating compression.
Aage R. Møller - One of the best experts on this subject based on the ideXlab platform.
-
Pathogenesis and Treatment of Hemifacial Spasm
Microvascular Decompression Surgery, 2015Co-Authors: Aage R. MøllerAbstract:Hemifacial spasm can be cured by microvascular decompression (MVD) operations of the root Exit Zone of the facial nerve. This fact was the basis for the (“ephaptic”) hypothesis stating that the anatomical location of the pathology that generates the signs of HFS, spasm in the mimic muscle on one side of the face and synkinesis, was the root Exit Zone of the facial nerve. However, later intracranial recording from the facial nerve provided strong experimental support of a different hypothesis about the pathology of HFS, namely, that the anatomical location of the pathology is the facial motonucleus.
-
is the root entry Exit Zone important in microvascular compression syndromes
Neurosurgery, 2002Co-Authors: Dirk De Ridder, Aage R. Møller, J Verlooy, Maria Cornelissen, Leo De RidderAbstract:OBJECTIVE Microvascular compression syndromes such as trigeminal neuralgia, hemifacial spasm, and disabling positional vertigo involve an artery or vein compressing a cranial nerve. A cranial nerve is composed of a central nervous system (CNS) segment and a peripheral nervous system (PNS) segment se
-
Is the root entry/Exit Zone important in microvascular compression syndromes?
Neurosurgery, 2002Co-Authors: Dirk De Ridder, Aage R. Møller, J Verlooy, Maria Cornelissen, Leo De RidderAbstract:OBJECTIVE Microvascular compression syndromes such as trigeminal neuralgia, hemifacial spasm, and disabling positional vertigo involve an artery or vein compressing a cranial nerve. A cranial nerve is composed of a central nervous system (CNS) segment and a peripheral nervous system (PNS) segment se
Hiroshi Shima - One of the best experts on this subject based on the ideXlab platform.
-
Diagnostic accuracy of multifidus muscle spontaneous activity by needle electromyography for the detection of lumbar foraminal and lateral Exit-Zone stenosis
European Spine Journal, 2015Co-Authors: Mikinobu Takeuchi, Norimitsu Wakao, Mitsuhiro Kamiya, Masahiko Gosho, Koji Osuka, Atsuhiko Hirasawa, Aichi Niwa, Masahiro Aoyama, Reo Kawaguchi, Hiroshi ShimaAbstract:Purpose The medial branch of the posterior ramus of the lumbar spinal nerve is well known to be innervated independently and to end in the multifidus muscle without anastomosis. This prospective cohort study aimed to determine the diagnostic specificity and sensitivity of multifidus muscle denervation (MMD) by needle electromyography (N-EMG) for lumbar foraminal and lateral Exit-Zone stenosis (LF/LEZS). Methods We enrolled 61 consecutive patients experiencing unilateral dysesthesia and/or leg pain in the L4 or L5 regions with suspicious LF/LEZS. The Japanese Orthopedic Association (JOA) score, Visual Analog Scale (VAS) for leg pain, and N-EMG were examined. In this study protocol, all patients received at least 3 months of conservative therapy. Surgery was performed on patients who experienced less than 50 % VAS pain relief compared with their initial score after confirming the responsible level by lumbar nerve root block. The specificity of N-EMG was the proportion of patients who improved with conservative therapies (non-surgery) after 3 months. The sensitivity of N-EMG was the proportion of patients who improved with surgical therapies (surgery) after more than 12 months. Results Twenty-three patients underwent surgery. The initial lower JOA, positive Kemp test and motor weakness were significantly higher in the surgery group. The MMD by N-EMG indicated that 34 of 38 patients were negative in the non-surgery group. In the surgery group, 21 of 23 patients were positive. The diagnostic sensitivity and specificity were 91.3 and 92.1 %, respectively. Conclusions Needle electromyography is a simple and available additional method for the diagnosis of LF/LEZS.
-
Diagnostic accuracy of multifidus muscle spontaneous activity by needle electromyography for the detection of lumbar foraminal and lateral Exit-Zone stenosis.
European Spine Journal, 2015Co-Authors: Mikinobu Takeuchi, Norimitsu Wakao, Mitsuhiro Kamiya, Masahiko Gosho, Koji Osuka, Atsuhiko Hirasawa, Aichi Niwa, Masahiro Aoyama, Reo Kawaguchi, Hiroshi ShimaAbstract:Purpose The medial branch of the posterior ramus of the lumbar spinal nerve is well known to be innervated independently and to end in the multifidus muscle without anastomosis. This prospective cohort study aimed to determine the diagnostic specificity and sensitivity of multifidus muscle denervation (MMD) by needle electromyography (N-EMG) for lumbar foraminal and lateral Exit-Zone stenosis (LF/LEZS).
Leo De Ridder - One of the best experts on this subject based on the ideXlab platform.
-
is the root entry Exit Zone important in microvascular compression syndromes
Neurosurgery, 2002Co-Authors: Dirk De Ridder, Aage R. Møller, J Verlooy, Maria Cornelissen, Leo De RidderAbstract:OBJECTIVE Microvascular compression syndromes such as trigeminal neuralgia, hemifacial spasm, and disabling positional vertigo involve an artery or vein compressing a cranial nerve. A cranial nerve is composed of a central nervous system (CNS) segment and a peripheral nervous system (PNS) segment se
-
Is the root entry/Exit Zone important in microvascular compression syndromes?
Neurosurgery, 2002Co-Authors: Dirk De Ridder, Aage R. Møller, J Verlooy, Maria Cornelissen, Leo De RidderAbstract:OBJECTIVE Microvascular compression syndromes such as trigeminal neuralgia, hemifacial spasm, and disabling positional vertigo involve an artery or vein compressing a cranial nerve. A cranial nerve is composed of a central nervous system (CNS) segment and a peripheral nervous system (PNS) segment se
K. Yamaguchi - One of the best experts on this subject based on the ideXlab platform.
-
Magnetic resonance tomographic angiography: diagnostic value in trigeminal neuralgia
Neuroradiology, 1995Co-Authors: F. Umchara, K. Kamishima, N. Kashio, K. Yamaguchi, T. Sakimoto, M. OsameAbstract:A combination of MRI, MR angiography and MR tomographic angiography (MRTA) was used to study the relationship to the root Exit Zone of the trigeminal nerve to surrounding vascular structures in seven patients with trigeminal neuralgia (TN) and ten patients with no evidence at a lesion in this region. MRTA is the technique for showing the relationship between vessels, cranial nerves and brain stem. MRTA clearly demonstrated the presence of a vessel at the root Exit Zone of the trigeminal nerve in all patients with TN. In the ten other patients, examination of 20 trigeminal nerves revealed that only one nerve (5%) was in contact with a vessel at the root Exit Zone. This study supports vascular compression of trigeminal nerves as a cause of TN, and demonstrates the value of MRTA as noninvasive technique for demonstrating compression.
-
Three-dimensional-MRI of neurovascular compression in patients with hemifacial spasm
Neuroradiology, 1995Co-Authors: T. Hosoya, K. Yamaguchi, N. Watanabe, S. Saito, O. NakaiAbstract:We prospectively studied 30 patients to assess the usefulness of three-dimensional (3D) contrastenhanced MRI in patients with hemifacial spasm. In all patients neurovascular compression of the facial nerve could be detected. Microvascular decompression was performed in 14, and vascular compression of the root Exit Zone of the facial nerve and the offending artery were exactyl as predicted by MRI in all but 2. We also retrospectively studied whether the symptomatic side could be defined only by enhanced 3D MRI in 55 randomised individuals (30 with and 25 without hemifacial spasm). All symptomatic sides were correctly identified, and the false-positive rate was 13.8%.