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Stereotactic and Functional Neurosurgery

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https://www.readbyqxmd.com/read/28810261/comparative-evaluation-of-magnetic-resonance-guided-focused-ultrasound-surgery-for-essential-tremor
#1
Minsoo Kim, Na Young Jung, Chang Kyu Park, Won Seok Chang, Hyun Ho Jung, Jin Woo Chang
BACKGROUND: Treatment options for patients with drug-resistant essential tremor (ET) are limited. Magnetic resonance-guided focused ultrasound surgery (MRgFUS) is an emerging technique to treat refractory ET. OBJECTIVES: To present MRgFUS as an alternative to radiofrequency (RF) thalamotomy or deep brain stimulation (DBS) for ET treatment. METHODS: We retrospectively analyzed 59 patients who underwent unilateral surgery for drug-resistant ET...
August 16, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28810243/evaluating-critical-brain-radiation-doses-in-the-treatment-of-multiple-brain-lesions-with-gamma-knife-radiosurgery
#2
Mustafa Aziz Hatiboglu, Kerime Akdur
BACKGROUND: Treatment of patients with multiple brain metastases has shifted to stereotactic radiosurgery, withholding whole-brain (WB) radiation therapy. However, radiation toxicity to the brain is a concern when treating multiple brain lesions with single-fraction stereotactic radiosurgery. OBJECTIVE: The purpose of this study was to determine the changes in brain radiation doses when treating various numbers of targets and lesion volumes. METHODS: We simulated different treatment plans with different combinations of varying tumor volumes including 0...
August 16, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28797005/gamma-knife-radiosurgery-for-cavernous-sinus-meningiomas-analysis-of-outcome-in-166-patients
#3
Maziar Azar, Farid Kazemi, Amin Jahanbakhshi, Iran Chanideh, Maryam Jalessi, Elahe Amini, Ghazale Geraily, Mohammad Farhadi
OBJECTIVES: The outcomes of Gamma Knife radiosurgery (GKRS) for cavernous sinus meningioma (CSM) are presented, and factors possibly affecting outcome are investigated. METHODS: The medical records and imaging and procedural reports of 166 patients with CSM were retrospectively reviewed. Demographic data, procedural data, symptomatic improvement, radiological regression, and progression-free survival (PFS) rates were evaluated. RESULTS: There were 124 women and 42 men; including 44 postoperative and 122 primary GKRS cases...
August 11, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28787721/refining-the-deep-brain-stimulation-target-within-the-limbic-globus-pallidus-internus-for-tourette-syndrome
#4
Ladan Akbarian-Tefaghi, Harith Akram, Johannes Johansson, Ludvic Zrinzo, Zinovia Kefalopoulou, Patricia Limousin, Eileen Joyce, Marwan Hariz, Karin Wårdell, Tom Foltynie
BACKGROUND: Deep brain stimulation (DBS) in patients with severe, refractory Tourette syndrome (TS) has demonstrated promising but variable results thus far. The thalamus and anteromedial globus pallidus internus (amGPi) have been the most commonly stimulated sites within the cortico-striato thalamic circuit, but an optimal target is yet to be elucidated. OBJECTIVES: This study of 15 patients with long-term amGPi DBS for severe TS investigated whether a specific anatomical site within the amGPi correlated with optimal clinical outcome for the measures of tics, obsessive compulsive behaviour (OCB), and mood...
August 5, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28772275/deep-brain-stimulation-for-tremor-is-there-a-common-structure
#5
Michael Fiechter, Andreas Nowacki, Markus F Oertel, Jens Fichtner, Ines Debove, M Lenard Lachenmayer, Roland Wiest, Claudio L Bassetti, Andreas Raabe, Alain Kaelin-Lang, Michael W Schüpbach, Claudio Pollo
BACKGROUND: Subthalamic nucleus (STN) stimulation has been recognized to control resting tremor in Parkinson disease. Similarly, thalamic stimulation (ventral intermediate nucleus; VIM) has shown tremor control in Parkinson disease, essential, and intention tremors. Recently, stimulation of the posterior subthalamic area (PSA) has been associated with excellent tremor control. Thus, the optimal site of stimulation may be located in the surrounding white matter. AIMS: The objective of this work was to investigate the area of stimulation by determining the contact location correlated with the best tremor control in STN/VIM patients...
August 4, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28746939/consistency-between-targets-delineated-by-angiography-computed-tomography-and-magnetic-resonance-imaging-in-stereotactic-radiosurgery-for-arteriovenous-malformation
#6
Yu-Jie Huang, Shih-Wei Hsu, Tsair-Fwu Lee, Jih-Tsun Ho, Wu-Fu Chen
BACKGROUND: Target identification is important for radiosurgery for arteriovenous malformations (AVMs). Targets defined by different imaging modalities may be inconsistent in practice. OBJECTIVES: The goal of this study is to review and analyze the consistency between targets defined by different imaging modalities in radiosurgery for AVMs. METHODS: From March 2007 to June 2011, AVM patients for radiosurgery whose targets were delineated by angiography/computed tomography (CT)/magnetic resonance imaging (MRI) were reviewed...
July 27, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28728152/use-of-the-putamen-as-a-surrogate-anatomical-marker-for-the-internal-segment-of-the-globus-pallidus-in-deep-brain-stimulation-surgery
#7
John A Thompson, Dali Yin, Steven G Ojemann, Aviva Abosch
OBJECTIVE: The success of deep brain stimulation (DBS) of the internal segment of the globus pallidus (GPi) depends on accurately placing the electrode into the GPi motor territory. Direct targeting can be difficult as GPi laminar borders are not always clearly identifiable on MRI. Here, we report a method for using the putamen (PUT) as a surrogate anatomical marker to target the GPi. METHODS: We developed a PUT-based GPi targeting using the FGATIR (fast gray matter acquisition T1-weighted inversion recovery) MRI sequence and compared it with consensus coordinate-based indirect targeting...
July 21, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28723697/the-history-and-future-of-ablative-neurosurgery-for-major-depressive-disorder
#8
Matthew Volpini, Peter Giacobbe, G Rees Cosgrove, Anthony Levitt, Andres M Lozano, Nir Lipsman
BACKGROUND: There is an urgent need to develop safe and effective treatments for patients with treatment-resistant depression (TRD). Several neurosurgical procedures have been developed to treat the dysfunctional brain circuits implicated in major depression. OBJECTIVES: This review describes the most common ablative procedures used to treat major depressive disorder: anterior cingulotomy, subcaudate tractotomy, limbic leucotomy, and anterior capsulotomy. The efficacy and safety of each are discussed and compared with other current and emerging modalities, including deep brain stimulation (DBS) and MR-guided focused ultrasound (MRgFUS)...
July 20, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28683438/gamma-knife-radiosurgery-for-petroclival-meningioma-long-term-outcome-and-failure-pattern
#9
Jin Wook Kim, Dong Gyu Kim, Young-Bem Se, Sung Kwon Kim, Hyun-Tai Chung, Sun Ha Paek, Hee-Won Jung
Total removal of petroclival meningioma is difficult, and aggressive extirpation is often associated with significant surgical morbidity and mortality. The aim of this study was to evaluate the long-term outcome and failure pattern of treatment with Gamma Knife radiosurgery (GKRS) in patients with petroclival meningiomas. Eighty-nine consecutive patients with petroclival meningiomas underwent GKRS between 1998 and 2013. Fifty-eight patients received GKRS as a primary treatment and 31 patients underwent GKRS as a secondary treatment after microsurgery...
July 6, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28641280/17th-quadrennial-meeting-of-the-world-society-for-stereotactic-and-functional-neurosurgery-berlin-germany-june-26-29-2017-abstracts
#10
(no author information available yet)
No abstract text is available yet for this article.
June 22, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28614824/compact-intraoperative-mri-stereotactic-accuracy-and-future-directions
#11
Daniel Markowitz, Dishen Lin, Sussan Salas, Nina Kohn, Michael Schulder
BACKGROUND: Intraoperative imaging must supply data that can be used for accurate stereotactic navigation. This information should be at least as accurate as that acquired from diagnostic imagers. OBJECTIVES: The aim of this study was to compare the stereotactic accuracy of an updated compact intraoperative MRI (iMRI) device based on a 0.15-T magnet to standard surgical navigation on a 1.5-T diagnostic scan MRI and to navigation with an earlier model of the same system...
2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28605737/a-nationwide-study-of-stereotactic-radiosurgery-in-a-newly-diagnosed-spine-metastasis-population
#12
Seil Sohn, Jinhee Kim, Chun Kee Chung, Na Rae Lee, Ung-Kyu Chang, Moon Jun Sohn
BACKGROUND: Stereotactic radiosurgery (SRS), a technique that is emerging as a new treatment option, has been reported to be an effective, noninvasive treatment for spine metastasis patients. OBJECTIVE: This nationwide study aimed to understand the current state of SRS for spine metastasis. METHODS: Patients in this study were first diagnosed with a metastatic spine tumor between 1 July and 31 December 2011. One group (the SRS group) received SRS at least once within 1 year of diagnosis and the other (the non-SRS group) did not receive SRS...
2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28601874/accuracy-of-intraoperative-computed-tomography-during-deep-brain-stimulation-procedures-comparison-with-postoperative-magnetic-resonance-imaging
#13
Maarten Bot, Pepijn van den Munckhof, Roy Bakay, Glenn Stebbins, Leo Verhagen Metman
OBJECTIVE: To determine the accuracy of intraoperative computed tomography (iCT) in localizing deep brain stimulation (DBS) electrodes by comparing this modality with postoperative magnetic resonance imaging (MRI). BACKGROUND: Optimal lead placement is a critical factor for the outcome of DBS procedures and preferably confirmed during surgery. iCT offers 3-dimensional verification of both microelectrode and lead location during DBS surgery. However, accurate electrode representation on iCT has not been extensively studied...
2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28571034/remotely-programmed-deep-brain-stimulation-of-the-bilateral-subthalamic-nucleus-for-the-treatment-of-primary-parkinson-disease-a-randomized-controlled-trial-investigating-the-safety-and-efficacy-of-a-novel-deep-brain-stimulation-system
#14
Dianyou Li, Chencheng Zhang, Judith Gault, Wei Wang, Jianmin Liu, Ming Shao, Yanyan Zhao, Kristina Zeljic, Guodong Gao, Bomin Sun
BACKGROUND: Deep brain stimulation (DBS) is the most commonly performed surgery for the debilitating symptoms of Parkinson disease (PD). However, DBS systems remain largely unaffordable to patients in developing countries, warranting the development of a safe, economically viable, and functionally comparable alternative. OBJECTIVE: To investigate the efficacy and safety of wirelessly programmed DBS of bilateral subthalamic nucleus (STN) in patients with primary PD...
2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28531896/gamma-knife-radiosurgery-for-vestibular-schwannomas-and-quality-of-life-evaluation
#15
Oren Berkowitz, Yueh-Ying Han, Evelyn O Talbott, Aditya K Iyer, Hideyuki Kano, Douglas Kondziolka, Mason A Brown, L Dade Lunsford
BACKGROUND: Further investigation is needed to look at the impact of vestibular schwannoma (VS) on the health-related quality of life (QOL) of participants who undergo Gamma Knife® radiosurgery (GKRS). OBJECTIVES: Investigators compared the QOL for VS participants to reported US population norms in order to evaluate disease burden and long-term QOL several years after GKRS. METHODS: This cross-sectional study surveyed participants to assess hearing status, tinnitus, imbalance, vertigo, as well as the Short-Form 36-item Health Questionnaire (SF-36)...
2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28501876/stereotactic-radiosurgery-as-initial-surgical-management-for-elderly-patients-with-trigeminal-neuralgia
#16
Jonathan Cohen, Seyed H Mousavi, Amir H Faraji, Berkcan Akpinar, Edward A Monaco, John C Flickinger, Ajay Niranjan, L Dade Lunsford
BACKGROUND: Management of older patients with medically refractory trigeminal neuralgia (TN) is yet a matter of debate. OBJECTIVE: We sought to determine the benefit of stereotactic radiosurgery (SRS) as the sole surgical management in older patients (≥70 years). METHODS: One hundred and twenty-seven patients (≥70 years) with typical TN underwent SRS as initial surgical management. The median maximum dose for the first procedure was 80 Gy...
2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28501875/five-year-neuropsychological-outcome-after-stereotactic-radiofrequency-amygdalohippocampectomy-for-mesial-temporal-lobe-epilepsy-longitudinal-study
#17
Lenka Krámská, Zdeněk Vojtěch, Jiří Lukavský, Michaela Stará, Hana Malíková
PURPOSE: To assess the neuropsychological performance recoded over a period of 5 years after stereotactic radiofrequency amygdalohippocampectomy (SAHE) in the treatment of mesial temporal lobe epilepsy. MATERIAL AND METHODS: Thirty patients (mean age 38 years, 14 females/16 males) were included in this study. Twenty-one patients were treated on the left side, 9 on the right. Patients underwent neuropsychological evaluation by the Wechsler Adult Intelligence Scale-Revised and the Wechsler Memory Scale-Revised preoperatively and 5 years after SAHE...
2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28486221/evaluation-of-clinical-application-and-dosimetric-comparison-of-treatment-plans-of-gamma-knife-and-cyberknife-in-treating-arteriovenous-malformations
#18
Chun-Yuan Kuo, Yi-Chieh Tsai, An-Cheng Shiau, Hao-Wen Cheng, Hsiao-Wei Yu, Yu-Kai Su, Jo-Ting Tsai
PURPOSE: To analyze and compare the characteristics of dose distributions for Leksell Gamma Knife Perfexion (LGK-PFX) and CyberKnife (CK) in treating arteriovenous malformations (AVMs). SUBJECTS AND METHODS: Twenty-four patients with AVMs who received CK radiosurgery at a prescribed dose (PD) of 16-25 Gy in a single fraction were selected. A LGK-PFX treatment plan with the same PD was designed for each patient. Dosimetric values for both systems were compared with respect to the conformity index (CI); selectivity index (SI); gradient index (GI) of 75, 50, and 25% of the PD; heterogeneity index; volume of the brain tissue covered by doses of 10 and 12 Gy; maximum dose delivered to the brainstem; and beam-on time...
2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28434004/what-do-medical-students-know-about-deep-brain-stimulation
#19
Andreas Wloch, Assel Saryyeva, Hans E Heissler, Christoph Schrader, H Holger Capelle, Joachim K Krauss
BACKGROUND: Deep brain stimulation (DBS) is an established therapy for movement disorders. It is currently under investigation in neuropsychiatric disorders. Neurophobia is a common phenomenon that might have a negative impact in medical education. Little is known about medical students' knowledge about DBS when they enter university and what they learn about it during their medical formation. METHODS: A 10-item questionnaire was designed. Questions addressed indications for DBS, costs of DBS, complications, the percentage of Parkinson disease (PD) patients who might profit from DBS, etc...
2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28433987/radiofrequency-lesions-through-deep-brain-stimulation-electrodes-in-movement-disorders-case-report-and-review-of-the-literature
#20
Javier Pérez-Suárez, Cristina V Torres Díaz, Lydia López Manzanares, Marta Navas García, Jesús Pastor, Patricia Barrio Fernández, Rafael G de Sola
BACKGROUND: Although there are few reports of radiofrequency lesions performed through deep brain stimulation (DBS) electrodes in patients with movement disorders, experience with this method is scarce. METHODS: We present 2 patients who had been previously treated with DBS of subthalamic nuclei (STN) and the ventral intermediate (VIM) nucleus of the thalamus for Parkinson's disease and essential tremor, respectively, and underwent a radiofrequency lesion through their DBS electrodes after developing a hardware infection...
2017: Stereotactic and Functional Neurosurgery
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