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Duffau H. A Personalized Longitudinal Strategy in Low-Grade Glioma Patients: Predicting Oncological and Neural Interindividual Variability and Its Changes over Years to Think One Step Ahead. J Pers Med 2022; 12:jpm12101621. [PMID: 36294760 PMCID: PMC9604939 DOI: 10.3390/jpm12101621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 09/15/2022] [Accepted: 09/22/2022] [Indexed: 11/09/2022] Open
Abstract
Diffuse low-grade glioma (LGG) is a rare cerebral cancer, mostly involving young adults with an active life at diagnosis. If left untreated, LGG widely invades the brain and becomes malignant, generating neurological worsening and ultimately death. Early and repeat treatments for this incurable tumor, including maximal connectome-based surgical resection(s) in awake patients, enable postponement of malignant transformation while preserving quality of life owing to constant neural network reconfiguration. Due to considerable interindividual variability in terms of LGG course and consecutive cerebral reorganization, a multistage longitudinal strategy should be tailored accordingly in each patient. It is crucial to predict how the glioma will progress (changes in growth rate and pattern of migration, genetic mutation, etc.) and how the brain will adapt (changes in patterns of spatiotemporal redistribution, possible functional consequences such as epilepsy or cognitive decline, etc.). The goal is to anticipate therapeutic management, remaining one step ahead in order to select the optimal (re-)treatment(s) (some of them possibly kept in reserve), at the appropriate time(s) in the evolution of this chronic disease, before malignization and clinical worsening. Here, predictive tumoral and non-tumoral factors, and their ever-changing interactions, are reviewed to guide individual decisions in advance based on patient-specific markers, for the treatment of LGG.
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Affiliation(s)
- Hugues Duffau
- Department of Neurosurgery, Gui de Chauliac Hospital, Montpellier University Medical Center, 80 Av. Augustin Fliche, 34295 Montpellier, France; ; Tel.: +33-4-67-33-66-12; Fax: +33-4-67-33-69-12
- Team “Plasticity of Central Nervous System, Stem Cells and Glial Tumors”, National Institute for Health and Medical Research (INSERM), U1191 Laboratory, Institute of Functional Genomics, University of Montpellier, 34091 Montpellier, France
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Duffau H. Dynamic Interplay between Lower-Grade Glioma Instability and Brain Metaplasticity: Proposal of an Original Model to Guide the Therapeutic Strategy. Cancers (Basel) 2021; 13:4759. [PMID: 34638248 PMCID: PMC8507523 DOI: 10.3390/cancers13194759] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 09/17/2021] [Accepted: 09/20/2021] [Indexed: 11/16/2022] Open
Abstract
The behavior of lower-grade glioma (LGG) is changing over time, spontaneously, and in reaction to treatments. First, due to genomic instability and clonal expansion, although LGG progresses slowly during the early period of the disease, its growth velocity will accelerate when this tumor will transform to a higher grade of malignancy. Furthermore, its pattern of progression may change following therapy, e.g., by switching from a proliferative towards a more diffuse profile, in particular after surgical resection. In parallel to this plasticity of the neoplasm, the brain itself is constantly adapting to the tumor and possible treatment(s) thanks to reconfiguration within and between neural networks. Furthermore, the pattern of reallocation can also change, especially by switching from a perilesional to a contrahemispheric functional reorganization. Such a reorientation of mechanisms of cerebral reshaping, related to metaplasticity, consists of optimizing the efficiency of neural delocalization in order to allow functional compensation by adapting over time the profile of circuits redistribution to the behavioral modifications of the glioma. This interplay between LGG mutations and reactional connectomal instability leads to perpetual modulations in the glioma-neural equilibrium, both at ultrastructural and macroscopic levels, explaining the possible preservation of quality of life despite tumor progression. Here, an original model of these dynamic interactions across LGG plasticity and the brain metanetwork is proposed to guide a tailored step-by-step individualized therapeutic strategy over years. Integration of these new parameters, not yet considered in the current guidelines, might improve management of LGG patients.
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Affiliation(s)
- Hugues Duffau
- Department of Neurosurgery, Montpellier University Medical Center, 34295 Montpellier, France; ; Tel.: +33-4-67-33-66-12
- Institute of Functional Genomics, University of Montpellier, 34295 Montpellier, France
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3
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Battista F, Muscas G, Scoccianti S, Buccoliero AM, Gadda D, Della Puppa A. Brain low-grade gliomas with high-grade spinal localization. Report of a clinical case and systematic literature review. J Neurosurg Sci 2021; 66:151-157. [PMID: 34545732 DOI: 10.23736/s0390-5616.21.05446-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
INTRODUCTION Oncological aggressiveness and the ability to present distant localizations are known in high-grade gliomas (HGGs), but the knowledge about the possible aggressiveness of LGGs is scarce, especially concerning possible spinal localization. EVIDENCE ACQUISITION A systematic search of LGGs with spinal localization on the three primary online databases (PubMed/MEDLINE, Embase, and Cochrane) was conducted. We included adult patients with histological diagnosis of intracranial LGG and specified WHO grade showing a remote spinal localization during follow-up. Additionally, we present a case of a left temporal LGG presenting a spinal localization fourteen years after the first appearance. We compared the survival rates of LGGs in our series with those of LGGs without spinal localizations. EVIDENCE SYNTHESIS Seven articles dealing with the subject and eight patients were considered (including our case), with a mean age at diagnosis of 42.25 years (range 26-69 years). The mean latency between a diagnosis of intracranial LGGs and a spinal localization occurrence was 7.37 years (range 2-14 years), and an increased WHO grade of the spinal localization compared to the brain LGG was observed in all patients. There was no sign of intracranial progression at the time of spinal glioma diagnosis in four cases, including ours. Survival at ten years was 28% against a 10-year survival rate of 65-71% for LGGs without distant localization, as reported in the literature. CONCLUSIONS Spinal metastasis of intracranial LGGs is an adverse prognostic factor. Surgical violation of ventricles can play a role in the pathophysiology of CSF spread of tumor cells in LGGs.
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Affiliation(s)
- Francesca Battista
- Department of Neurosurgery, Department of Neuroscience, Psychology, Drug Area and Child Health (NEUROFARBA), Careggi University Hospital, University of Florence, Florence, Italy -
| | - Giovanni Muscas
- Department of Neurosurgery, Department of Neuroscience, Psychology, Drug Area and Child Health (NEUROFARBA), Careggi University Hospital, University of Florence, Florence, Italy
| | - Silvia Scoccianti
- Department of Radiation Oncology, Santa Maria Annunziata Hospital, Florence, Italy
| | - Anna Maria Buccoliero
- Pathology Unit, Meyer Children's Hospital and University of Florence, Florence, Italy
| | - Davide Gadda
- Department of Neuroradiology, Careggi University Hospital and University of Florence, Florence, Italy
| | - Alessandro Della Puppa
- Department of Neurosurgery, Department of Neuroscience, Psychology, Drug Area and Child Health (NEUROFARBA), Careggi University Hospital, University of Florence, Florence, Italy
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Das KK, Singh A, Khatri D, Gosal JS, Bhaisora K, Mehrotra A, Gogoi S, Behari S. The Dilemma of Multifocality in Insular Tumors: Multicentricity versus Metastasis. Asian J Neurosurg 2021; 16:72-77. [PMID: 34211870 PMCID: PMC8202396 DOI: 10.4103/ajns.ajns_458_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 12/23/2020] [Accepted: 02/04/2021] [Indexed: 11/05/2022] Open
Abstract
Background and Purpose: Multifocality and metastasis from insular glioma are extremely rare. Pathological insights and elaboration of the clinical course of this condition will contribute to their better understanding. Materials and Methods: Among 123 consecutively operated insular gliomas, 5 patients (4.2%) presented with a multifocal tumor. The clinico-radiological, histo-molecular, and treatment outcomes were noted and compared with the unifocal insular glioma cohort. Results: Among the five patients, all were males and involved the right insular lobe. Three patients presented with synchronous tumors, while two patients developed metachronous multifocal tumors. The histology of the insular tumor was Grade I glioma in 1, Grade II astrocytoma with p53 mutation in 2, and anaplastic astrocytoma and glioblastoma in one patient each. Histological confirmation of the second lesion was performed in two patients, showing the same histology of the insular tumor. Interconnection between the tumors was apparent through cerebrospinal fluid pathways in four patients, while no such connection could be established in one patient. Barring the patient of Grade I glioma, the rest of the patients died within months of the diagnosis. Conclusion: Multifocal insular glioma is rare and probably represents a biologically more aggressive tumor. Insular glioma that touches the ventricle appears a common denominator for multifocality. True multicentricity is rare. The prognosis in insular glioma with multifocality is poor in non-Grade I gliomas.
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Affiliation(s)
- Kuntal Kanti Das
- Department of Neurosurgery, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Amanjot Singh
- Department of Neurosurgery, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Deepak Khatri
- Department of Neurosurgery, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Jaskaran Singh Gosal
- Department of Neurosurgery, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Kamlesh Bhaisora
- Department of Neurosurgery, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Anant Mehrotra
- Department of Neurosurgery, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Sudarsana Gogoi
- Department of Pathology, Era's Lucknow Medical College and Hospital, Lucknow, Uttar Pradesh, India
| | - Sanjay Behari
- Department of Neurosurgery, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
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The landscape of postsurgical recurrence patterns in diffuse low-grade gliomas. Crit Rev Oncol Hematol 2019; 138:148-155. [PMID: 31092371 DOI: 10.1016/j.critrevonc.2019.04.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 04/02/2019] [Accepted: 04/08/2019] [Indexed: 12/20/2022] Open
Abstract
Early and maximal safe surgical resection optionally followed by adjuvant treatment is currently recommended in diffuse low-grade glioma (DLGG). Although this management delays malignant transformation (MT), recurrence will most often occur. Because this relapse usually arises locally, reoperation can be considered, with possible further chemotherapy/radiotherapy. However, due to a prolonged overall survival, a large spectrum of unusual recurrence patterns begins to emerge during long-term follow-up, beyond the classical slow and local tumor re-growth. We review various atypical patterns of DLGG relapse, we discuss their pathophysiological mechanisms and how to adapt the treatment(s). Those patterns include very diffuse, ipsi- or bilateral gliomatosis-like progression, multicentric recurrence with emergence of remote low-grade or high-grade glioma, leptomeningeal dissemination, acute (early or delayed) local MT or bulky relapse into the operating cavity. This landscape of recurrence patterns may allow physicians to elaborate new tailored therapeutic strategies and scientists to develop original hypotheses for basic research.
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Chowdhary S, Damlo S, Chamberlain MC. Cerebrospinal Fluid Dissemination and Neoplastic Meningitis in Primary Brain Tumors. Cancer Control 2017; 24:S1-S16. [PMID: 28557973 DOI: 10.1177/107327481702400118] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Neoplastic meningitis, also known as leptomeningeal disease, affects the entire neuraxis. The clinical manifestations of the disease may affect the cranial nerves, cerebral hemispheres, or the spine. Because of the extent of disease involvement, treatment options and disease staging should involve all compartments of the cerebrospinal fluid (CSF) and subarachnoid space. Few studies of patients with primary brain tumors have specifically addressed treatment for the secondary complication of neoplastic meningitis. Therapy for neoplastic meningitis is palliative in nature and, rarely, may have a curative intent. METHODS A review of the medical literature pertinent to neoplastic meningitis in primary brain tumors was performed. The complication of neoplastic meningitis is described in detail for the various types of primary brain tumors. RESULTS Treatment of neoplastic meningitis is complicated because determining who should receive aggressive, central nervous system (CNS)-directed therapy is difficult. In general, the therapeutic response of neoplastic meningitis is a function of CSF cytology and, secondarily, of the clinical improvement in neurological manifestations related to the disease. CSF cytology may manifest a rostrocaudal disassociation; thus, consecutive, negative findings require that both lumbar and ventricular cytological testing are performed to confirm the complete response. Based on data from several prospective, randomized trials extrapolated to primary brain tumors, the median rate of survival for neoplastic meningitis is several months. Oftentimes, therapy directed at palliation may improve quality of life by protecting patients from experiencing continued neurological deterioration. CONCLUSIONS Neoplastic meningitis is a complicated disease in which response to therapy varies by histology. Thus, survival rates after CNS-directed therapy will differ by the underlying primary tumor. Optimal therapy of neoplastic meningitis is poorly defined, and few guidelines exist to guide clinicians on the most appropriate choice of therapy.
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Affiliation(s)
| | | | - Marc C Chamberlain
- Seattle Cancer Care Alliance, Cascadian Therapeutics, Seattle, Washington, USA.
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de Eulate-Beramendi SA, Piña-Batista KM, Rodrigo V, Torres-Rivas HE, Rial-Basalo JC. Multicentric spinal cord and brain glioblastoma without previous craniotomy. Surg Neurol Int 2016; 7:S492-4. [PMID: 27512613 PMCID: PMC4960921 DOI: 10.4103/2152-7806.185785] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 05/03/2016] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND Glioblastoma multiforme (GBS) is a highly malignant glioma that rarely presents as an infratentorial tumor. Multicentric gliomas lesions are widely separated in site and/or time and its incidence has been reported between 0.15 and 10%. Multicentric gliomas involving supratentorial and infratentorial region are even more rare. In most cases, infratentorial disease is seen after surgical manipulation or radiation therapy and is usually located in the cerebellum or cervical region. CASE REPORT We present a rare case of symptomatic multicentric glioma in the brain, fourth ventricle, cervical as well as lumbar glioblastoma in an adult without previous therapeutic intervention. We also review the literature of this rare presentation. CONCLUSIONS This report suggests that GBM is a diffuse disease; the more extended the disease, the worse prognosis it has. The management still remains controversial and further studies are required to understand the prognosis factors of dissemination.
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Affiliation(s)
| | | | - Victor Rodrigo
- Department of Neurosurgery, Hospital Clinico Universitario Lozano Blesa, Zaragoza, Spain
| | - Hector E Torres-Rivas
- Department of Anatomopathology, Hospital Universitario Central de Asturias, Oviedo, Spain
| | - Juan C Rial-Basalo
- Department of Neurosurgery, Hospital Universitario Central de Asturias, Oviedo, Spain
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Ki SY, Kim SK, Heo TW, Baek BH, Kim HS, Yoon W. Chordoid Glioma with Intraventricular Dissemination: A Case Report with Perfusion MR Imaging Features. Korean J Radiol 2016; 17:142-6. [PMID: 26798226 PMCID: PMC4720801 DOI: 10.3348/kjr.2016.17.1.142] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Accepted: 09/15/2015] [Indexed: 11/15/2022] Open
Abstract
Chordoid glioma is a rare low grade tumor typically located in the third ventricle. Although a chordoid glioma can arise from ventricle with tumor cells having features of ependymal differentiation, intraventricular dissemination has not been reported. Here we report a case of a patient with third ventricular chordoid glioma and intraventricular dissemination in the lateral and fourth ventricles. We described the perfusion MR imaging features of our case different from a previous report.
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Affiliation(s)
- So Yeon Ki
- Department of Radiology, Chonnam National University Medical School, Chonnam National University Hospital, Gwangju 61469, Korea
| | - Seul Kee Kim
- Department of Radiology, Chonnam National University Medical School, Chonnam National University Hospital, Gwangju 61469, Korea
| | - Tae Wook Heo
- Department of Radiology, Chonnam National University Medical School, Chonnam National University Hospital, Gwangju 61469, Korea
| | - Byung Hyun Baek
- Department of Radiology, Chonnam National University Medical School, Chonnam National University Hospital, Gwangju 61469, Korea
| | - Hyung Seok Kim
- Department ofForensic Medicine, Chonnam National University Medical School, Chonnam National University Hospital, Gwangju 61469, Korea
| | - Woong Yoon
- Department of Radiology, Chonnam National University Medical School, Chonnam National University Hospital, Gwangju 61469, Korea
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Roelz R, Reinacher P, Jabbarli R, Kraeutle R, Hippchen B, Egger K, Weyerbrock A, Machein M. Surgical Ventricular Entry is a Key Risk Factor for Leptomeningeal Metastasis of High Grade Gliomas. Sci Rep 2015; 5:17758. [PMID: 26635136 PMCID: PMC4669436 DOI: 10.1038/srep17758] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 11/03/2015] [Indexed: 01/29/2023] Open
Abstract
Leptomeningeal metastasis (LM) of high grade gliomas (HGG) can lead to devastating disease courses. Understanding of risk factors for LM is important to identify patients at risk. We reviewed patient records and magnetic resonance imaging (MRI) of all patients with a first diagnosis of HGG who underwent surgery in our institution between 2008 and 2012. To assess the influence of potential risk factors for LM and the impact of LM on survival multivariate statistics were performed. 239 patients with a diagnosis of HGG and at least 6 months of MRI and clinical follow-up were included. LM occurred in 27 (11%) patients and was symptomatic in 17 (65%). A strong correlation of surgical entry to the ventricle and LM was found (HR: 8.1). Ventricular entry was documented in 137 patients (57%) and LM ensued in 25 (18%) of these. Only two (2%) of 102 patients without ventricular entry developed LM. Median overall survival of patients after diagnosis of LM (239 days) was significantly shorter compared to patients without LM (626 days). LM is a frequent complication in the course of disease of HGG and is associated with poor survival. Surgical entry to the ventricle is a key risk factor for LM.
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Affiliation(s)
- Roland Roelz
- Department of Neurosurgery, University Medical Center Freiburg, Breisacher Str. 64, 79106 Freiburg, Germany.,Department of Stereotactic and Functional Neurosurgery, University Medical Center Freiburg, Breisacher Str. 64, 79106 Freiburg
| | - Peter Reinacher
- Department of Stereotactic and Functional Neurosurgery, University Medical Center Freiburg, Breisacher Str. 64, 79106 Freiburg
| | - Ramazan Jabbarli
- Department of Neurosurgery, University Medical Center Freiburg, Breisacher Str. 64, 79106 Freiburg, Germany.,Department of Neurosurgery, University Hospital Essen, Hufelandstr. 55, 45147, Germany
| | - Rainer Kraeutle
- Department of Nursing-IT, University Medical Center Freiburg, Hugstetter Str. 55, 79106 Freiburg
| | - Beate Hippchen
- Department of Neurosurgery, University Medical Center Freiburg, Breisacher Str. 64, 79106 Freiburg, Germany
| | - Karl Egger
- Department of Neuroradiology, University Medical Center Freiburg, Breisacher Str. 64, 79106 Freiburg, Germany
| | - Astrid Weyerbrock
- Department of Neurosurgery, University Medical Center Freiburg, Breisacher Str. 64, 79106 Freiburg, Germany
| | - Marcia Machein
- Department of Neurosurgery, University Medical Center Freiburg, Breisacher Str. 64, 79106 Freiburg, Germany
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Ogul H, Ozel L, Polat G, Koltas O, Kantarci M. Massive leptomeningeal dissemination of a low-grade thalamic astrocytoma in an adult patient. Acta Neurol Belg 2015; 115:415-9. [PMID: 25344827 DOI: 10.1007/s13760-014-0379-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Accepted: 10/11/2014] [Indexed: 11/30/2022]
Affiliation(s)
- Hayri Ogul
- Department of Radiology, Medical Faculty, Ataturk University, 25240, Erzurum, Turkey,
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Zabihyan S, Etemadrezaie H, Baharvahdat H, Baradaran A, Ganjeefar B, Bohl MA, Nakaji P. Remote transplantation of a third ventricle colloid cyst: case report. J Neurosurg 2015; 122:1406-10. [DOI: 10.3171/2014.9.jns14864] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The authors report the case of a 15-year-old girl with a third ventricle colloid cyst. She presented with prolonged headache, nausea, vomiting, and loss of visual acuity with bilateral papilledema. Computed tomography and MRI revealed severe biventricular hydrocephalus with transependymal periventricular fluid and a minimally enhancing cystic mass of the third ventricle. The patient was diagnosed with a colloid cyst and obstructive hydrocephalus, and endoscopic resection with ablation of the cyst remnant was performed. While attempting to extricate the cyst from the patient's head, control of the cyst was lost and the cyst fell into the lateral ventricle beyond the surgeon's view. Postoperative imaging showed that the cyst had settled in the right occipital horn. After 3 years of follow-up, imaging suggests growth of the cyst in its new position without necrosis or displacement on prone imaging.
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Affiliation(s)
- Samira Zabihyan
- 1Department of Neurological Surgery, Quaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran; and
| | - Hamid Etemadrezaie
- 1Department of Neurological Surgery, Quaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran; and
| | - Humain Baharvahdat
- 1Department of Neurological Surgery, Quaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran; and
| | - Aslan Baradaran
- 1Department of Neurological Surgery, Quaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran; and
| | - Babak Ganjeefar
- 1Department of Neurological Surgery, Quaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran; and
| | - Michael A. Bohl
- 2Division of Neurological Surgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona
| | - Peter Nakaji
- 2Division of Neurological Surgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona
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