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Lee JC, Tran QT, McGee RB, Perrino MR, Upadhyaya SA, Hanzlik EM, Pytel N, Carroll AJ, Orisme W, Eldomery M, Wang L, Blackburn PR, Furtado LV, Viaene AN, Luo M, Kalish JM, Pinto SN, Bag AK, Orr BA. Atypical teratoid/rhabdoid tumour-TYR subtype arising in the setting of germline ring chromosome 22: An uncommon form of tumour predisposition. Neuropathol Appl Neurobiol 2024; 50:e12971. [PMID: 38488196 DOI: 10.1111/nan.12971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 02/12/2024] [Accepted: 02/28/2024] [Indexed: 03/19/2024]
Affiliation(s)
- Julieann C Lee
- Department of Pathology, Neuropathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Quynh T Tran
- Department of Pathology, Neuropathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Rose B McGee
- Department of Oncology, Division of Cancer Predisposition, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Melissa R Perrino
- Department of Oncology, Division of Cancer Predisposition, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Santhosh A Upadhyaya
- Department of Pediatrics and Communicable Diseases, C. S. Mott Children's Hospital, University of Michigan, Ann Arbor, Michigan, USA
| | - Emily M Hanzlik
- Department of Pediatrics, Division of Neuro-Oncology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Nicholas Pytel
- Department of Pediatrics, Division of Neuro-Oncology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Andrew J Carroll
- Department of Genetics, University of Alabama, Birmingham, Alabama, USA
| | - Wilda Orisme
- Department of Pathology, Neuropathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Mohammad Eldomery
- Department of Pathology, Molecular Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Lu Wang
- Department of Pathology, Molecular Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Patrick R Blackburn
- Department of Pathology, Molecular Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Larissa V Furtado
- Department of Pathology, Molecular Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Angela N Viaene
- Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Minjie Luo
- Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Jennifer M Kalish
- Division of Human Genetics and Center for Childhood Cancer Research, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Departments of Genetics and Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Soniya N Pinto
- Department of Diagnostic Imaging, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Asim K Bag
- Department of Diagnostic Imaging, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Brent A Orr
- Department of Pathology, Neuropathology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
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2
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Chiang J, Bagchi A, Li X, Dhanda SK, Huang J, Pinto SN, Sioson E, Dalton J, Tatevossian RG, Jia S, Partap S, Fisher PG, Bowers DC, Hassall TEG, Lu C, Zaldivar-Peraza A, Wright KD, Broniscer A, Qaddoumi I, Upadhyaya SA, Vinitsky A, Sabin ND, Orr BA, Klimo P, Boop FA, Ashford JM, Conklin HM, Onar-Thomas A, Zhou X, Ellison DW, Gajjar A, Robinson GW. High-grade glioma in infants and young children is histologically, molecularly, and clinically diverse: Results from the SJYC07 trial and institutional experience. Neuro Oncol 2024; 26:178-190. [PMID: 37503880 PMCID: PMC10768990 DOI: 10.1093/neuonc/noad130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Indexed: 07/29/2023] Open
Abstract
BACKGROUND High-grade gliomas (HGG) in young children pose a challenge due to favorable but unpredictable outcomes. While retrospective studies broadened our understanding of tumor biology, prospective data is lacking. METHODS A cohort of children with histologically diagnosed HGG from the SJYC07 trial was augmented with nonprotocol patients with HGG treated at St. Jude Children's Research Hospital from November 2007 to December 2020. DNA methylome profiling and whole genome, whole exome, and RNA sequencing were performed. These data were integrated with histopathology to yield an integrated diagnosis. Clinical characteristics and preoperative imaging were analyzed. RESULTS Fifty-six children (0.0-4.4 years) were identified. Integrated analysis split the cohort into four categories: infant-type hemispheric glioma (IHG), HGG, low-grade glioma (LGG), and other-central nervous system (CNS) tumors. IHG was the most prevalent (n = 22), occurred in the youngest patients (median age = 0.4 years), and commonly harbored receptor tyrosine kinase gene fusions (7 ALK, 2 ROS1, 3 NTRK1/2/3, 4 MET). The 5-year event-free (EFS) and overall survival (OS) for IHG was 53.13% (95%CI: 35.52-79.47) and 90.91% (95%CI: 79.66-100.00) vs. 0.0% and 16.67% (95%CI: 2.78-99.74%) for HGG (p = 0.0043, p = 0.00013). EFS and OS were not different between IHG and LGG (p = 0.95, p = 0.43). Imaging review showed IHGs are associated with circumscribed margins (p = 0.0047), hemispheric location (p = 0.0010), and intratumoral hemorrhage (p = 0.0149). CONCLUSIONS HGG in young children is heterogeneous and best defined by integrating histopathological and molecular features. Patients with IHG have relatively good outcomes, yet they endure significant deficits, making them good candidates for therapy de-escalation and trials of molecular targeted therapy.
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Affiliation(s)
- Jason Chiang
- Department of Pathology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Aditi Bagchi
- Department of Oncology, Division of Neuro-Oncology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Xiaoyu Li
- Department of Pathology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Sandeep K Dhanda
- Department of Oncology, Division of Neuro-Oncology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Jie Huang
- Department of Biostatistics, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Soniya N Pinto
- Department of Diagnostic Imaging, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Edgar Sioson
- Department of Computational Biology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - James Dalton
- Department of Pathology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Ruth G Tatevossian
- Cancer Biomarkers Laboratory, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Sujuan Jia
- Cancer Biomarkers Laboratory, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Sonia Partap
- Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA
| | - Paul G Fisher
- Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA
| | - Daniel C Bowers
- Division of Pediatric Hematology-Oncology, University of Texas Southwestern Medical School, Dallas, TX, USA
| | | | - Congyu Lu
- Department of Computational Biology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Airen Zaldivar-Peraza
- Department of Computational Biology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Karen D Wright
- Dana Farber/Boston Children’s Cancer and Blood Disorders Center, Boston, MA, USA
| | - Alberto Broniscer
- Department of Oncology, Division of Neuro-Oncology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Ibrahim Qaddoumi
- Department of Oncology, Division of Neuro-Oncology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Santhosh A Upadhyaya
- Department of Pediatrics, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Anna Vinitsky
- Department of Oncology, Division of Neuro-Oncology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Noah D Sabin
- Department of Diagnostic Imaging, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Brent A Orr
- Department of Pathology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Paul Klimo
- Department of Surgery, St Jude Children’s Research Hospital, Memphis, TN, USA
- Department of Neurosurgery, University of Tennessee Health and Science Center, Memphis, TN, USA
- Le Bonheur Neuroscience Institute, Le Bonheur Children’s Hospital, Memphis, TN, USA
| | - Frederick A Boop
- Department of Surgery, St Jude Children’s Research Hospital, Memphis, TN, USA
- Department of Neurosurgery, University of Tennessee Health and Science Center, Memphis, TN, USA
- Le Bonheur Neuroscience Institute, Le Bonheur Children’s Hospital, Memphis, TN, USA
| | - Jason M Ashford
- Department of Psychology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Heather M Conklin
- Department of Psychology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Arzu Onar-Thomas
- Department of Biostatistics, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Xin Zhou
- Department of Computational Biology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - David W Ellison
- Department of Pathology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Amar Gajjar
- Department of Oncology, Division of Neuro-Oncology, St. Jude Children’s Research Hospital, Memphis, TN, USA
| | - Giles W Robinson
- Department of Oncology, Division of Neuro-Oncology, St. Jude Children’s Research Hospital, Memphis, TN, USA
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Pinto SN, Krenciute G. The Mechanisms of Altered Blood-Brain Barrier Permeability in CD19 CAR T-Cell Recipients. Int J Mol Sci 2024; 25:644. [PMID: 38203814 PMCID: PMC10779697 DOI: 10.3390/ijms25010644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 12/31/2023] [Accepted: 01/02/2024] [Indexed: 01/12/2024] Open
Abstract
Cluster of differentiation 19 (CD19) chimeric antigen receptor (CAR) T cells are a highly effective immunotherapy for relapsed and refractory B-cell malignancies, but their utility can be limited by the development of immune effector cell-associated neurotoxicity syndrome (ICANS). The recent discovery of CD19 expression on the pericytes in the blood-brain barrier (BBB) suggests an important off-target mechanism for ICANS development. In addition, the release of systemic cytokines stimulated by the engagement of CD19 with the CAR T cells can cause endothelial activation and decreased expression of tight junction molecules, further damaging the integrity of the BBB. Once within the brain microenvironment, cytokines trigger a cytokine-specific cascade of neuroinflammatory responses, which manifest clinically as a spectrum of neurological changes. Brain imaging is frequently negative or nonspecific, and treatment involves close neurologic monitoring, supportive care, interleukin antagonists, and steroids. The goal of this review is to inform readers about the normal development and microstructure of the BBB, its unique susceptibility to CD19 CAR T cells, the role of individual cytokines on specific elements of the brain's microstructural environment, and the clinical and imaging manifestations of ICANS. Our review will link cellular pathophysiology with the clinical and radiological manifestations of a complex clinical entity.
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Affiliation(s)
- Soniya N. Pinto
- Department of Diagnostic Imaging, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Giedre Krenciute
- Department of Bone Marrow Transplantation & Cellular Therapy, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA;
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4
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Pinto SN, Lerner A, Phung D, Barisano G, Chou B, Xu W, Sheikh-Bahaei N. Arterial Spin Labeling in Migraine: A Review of Migraine Categories and Mimics. J Cent Nerv Syst Dis 2023. [DOI: 10.1177/11795735231160032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023] Open
Abstract
Migraine is a complex headache characterized by changes in functional connectivity and cerebral perfusion. The perfusion changes represent a valuable domain for targeted drug therapy. Arterial spin labeling is a noncontrast imaging technique of quantifying cerebral perfusion changes in the migraine setting. In this narrative review, we will discuss the pathophysiology of the different categories of migraine, as defined by the International Classification of Headache Disorders-3 and describe a category-based approach to delineating perfusion changes in migraine on arterial spin labeling images. We will also discuss the use of arterial spin labeling to differentiate migraine from stroke and/or seizures in the adult and pediatric populations. Our systematic approach will help improve the understanding of the complicated vascular changes that occur during migraines and identify potential areas of future research.
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Affiliation(s)
- Soniya N Pinto
- Department of Diagnostic Imaging, St Jude Children’s Research Hospital, Memphis, TN, USA
| | - Alexander Lerner
- University of Southern California, Keck School of Medicine, Los Angeles, CA, USA
| | - Daniel Phung
- University of Southern California, Keck School of Medicine, Los Angeles, CA, USA
| | - Giuseppe Barisano
- University of Southern California, Keck School of Medicine, Los Angeles, CA, USA
| | - Brendon Chou
- University of Southern California, Keck School of Medicine, Los Angeles, CA, USA
| | - Wilson Xu
- University of Southern California, Keck School of Medicine, Los Angeles, CA, USA
| | - Nasim Sheikh-Bahaei
- University of Southern California, Keck School of Medicine, Los Angeles, CA, USA
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5
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Chou BC, Lerner A, Barisano G, Phung D, Xu W, Pinto SN, Sheikh-Bahaei N. Functional MRI and Diffusion Tensor Imaging in Migraine: A Review of Migraine Functional and White Matter Microstructural Changes. J Cent Nerv Syst Dis 2023; 15:11795735231205413. [PMID: 37900908 PMCID: PMC10612465 DOI: 10.1177/11795735231205413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Accepted: 09/14/2023] [Indexed: 10/31/2023] Open
Abstract
Migraine is a complex and heterogenous disorder whose disease mechanisms remain disputed. This narrative review summarizes functional MRI (fMRI) and diffusion tensor imaging (DTI) findings and interprets their association with migraine symptoms and subtype to support and expand our current understanding of migraine pathophysiology. Our PubMed search evaluated and included fMRI and DTI studies involving comparisons between migraineurs vs healthy controls, migraineurs with vs without aura, and episodic vs chronic migraineurs. Migraineurs demonstrate changes in functional connectivity (FC) and regional activation in numerous pain-related networks depending on migraine phase, presence of aura, and chronicity. Changes to diffusion indices are observed in major cortical white matter tracts extending to the brainstem and cerebellum, more prominent in chronic migraine and associated with FC changes. Reported changes in FC and regional activation likely relate to pain processing and sensory hypersensitivities. Diffuse white matter microstructural changes in dysfunctional cortical pain and sensory pathways complement these functional differences. Interpretations of reported fMRI and DTI measure trends have not achieved a clear consensus due to inconsistencies in the migraine neuroimaging literature. Future fMRI and DTI studies should establish and implement a uniform methodology that reproduces existing results and directly compares migraineurs with different subtypes. Combined fMRI and DTI imaging may provide better pathophysiological explanations for nonspecific FC and white matter microstructural differences.
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Affiliation(s)
- Brendon C. Chou
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Alexander Lerner
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | | | - Daniel Phung
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Wilson Xu
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Soniya N. Pinto
- Department of Diagnostic Imaging, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Nasim Sheikh-Bahaei
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
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6
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Pinto SN, Liu CSJ, Nelson MD, Bluml S, Livingston D, Tamrazi B. Neuroimaging of complications arising after CD19 chimeric antigen receptor T-cell therapy: A review. J Neuroimaging 2023; 33:703-715. [PMID: 37327044 DOI: 10.1111/jon.13138] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 06/02/2023] [Accepted: 06/05/2023] [Indexed: 06/17/2023] Open
Abstract
Chimeric antigen receptor (CAR) T cells targeting the CD19 (cluster of differentiation 19) cell surface glycoprotein have emerged as a highly effective immunologic therapy in patients with relapsed or refractory B-cell malignancies. The engagement of CAR T cells with CD19 on the surface of neoplastic B cells causes a systemic cytokine release, which can compromise the blood-brain barrier and cause an immune effector cell-associated neurotoxicity syndrome (ICANS). In a small proportion of ICANS patients who demonstrate neuroimaging abnormalities, certain distinct patterns have been recognized, including signal changes in the thalami, external capsule, and brainstem, the subcortical and/or periventricular white matter, the splenium of the corpus callosum, and the cerebellum. On careful review of the underlying pathophysiology of ICANS, we noticed that these changes closely mirror the underlying blood-brain barrier disruption and neuroinflammatory and excitotoxic effects of the offending cytokines released during ICANS. Furthermore, other uncommon complications of CD19 CAR T-cell therapy such as posterior reversible encephalopathy syndrome, ocular complications, and opportunistic fungal infections can be catastrophic if not diagnosed in a timely manner, with neuroimaging playing a significant role in management. In this narrative review, we will summarize the current literature on the spectrum of neuroimaging findings in ICANS, list appropriate differential diagnoses, and explore the imaging features of other uncommon central nervous system complications of CD19 CAR T-cell therapy using illustrative cases from two tertiary care institutions.
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Affiliation(s)
- Soniya N Pinto
- Department of Diagnostic Imaging, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Chia-Shang J Liu
- Division of Neuroradiology, Department of Radiology, Children's Hospital of Los Angeles, Los Angeles, California, USA
| | - Marvin D Nelson
- Division of Neuroradiology, Department of Radiology, Children's Hospital of Los Angeles, Los Angeles, California, USA
| | - Stefan Bluml
- Division of Neuroradiology, Department of Radiology, Children's Hospital of Los Angeles, Los Angeles, California, USA
| | - David Livingston
- Resident, Department of Radiology, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Benita Tamrazi
- Division of Neuroradiology, Department of Radiology, Children's Hospital of Los Angeles, Los Angeles, California, USA
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Pinto SN, Chiang J, Qaddoumi I, Livingston D, Bag A. Pediatric diencephalic tumors: a constellation of entities and management modalities. Front Oncol 2023; 13:1180267. [PMID: 37519792 PMCID: PMC10374860 DOI: 10.3389/fonc.2023.1180267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Accepted: 06/27/2023] [Indexed: 08/01/2023] Open
Abstract
The diencephalon is a complex midline structure consisting of the hypothalamus, neurohypophysis, subthalamus, thalamus, epithalamus, and pineal body. Tumors arising from each of these diencephalic components differ significantly in terms of biology and prognosis. The aim of this comprehensive review is to describe the epidemiology, clinical symptoms, imaging, histology, and molecular markers in the context of the 2021 WHO classification of central nervous system neoplasms. We will also discuss the current management of each of these tumors.
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Affiliation(s)
- Soniya N. Pinto
- Department of Diagnostic Imaging, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Jason Chiang
- Department of Pathology, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Ibrahim Qaddoumi
- Departments of Global Pediatric Medicine, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - David Livingston
- Department of Radiology, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Asim Bag
- Department of Diagnostic Imaging, St. Jude Children’s Research Hospital, Memphis, TN, United States
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Xu WJ, Barisano G, Phung D, Chou B, Pinto SN, Lerner A, Sheikh-Bahaei N. Structural MRI in Migraine: A Review of Migraine Vascular and Structural Changes in Brain Parenchyma. J Cent Nerv Syst Dis 2023; 15:11795735231167868. [PMID: 37077432 PMCID: PMC10108417 DOI: 10.1177/11795735231167868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 03/15/2023] [Indexed: 04/21/2023] Open
Abstract
Migraine is a complex and common disorder that affects patients around the world. Despite recent advances in this field, the exact pathophysiology of migraine is still not completely understood. Structural MRI sequences have revealed a variety of changes to brain parenchyma associated with migraine, including white matter lesions, volume changes, and iron deposition. This Review highlights different structural imaging findings in various types of migraine and their relationship to migraine characteristics and subtypes in order to improve our understanding of migraine, its pathophysiologic mechanisms, and how to better diagnose and treat it.
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Affiliation(s)
- Wilson J Xu
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | | | - Daniel Phung
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Brendon Chou
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | | | - Alexander Lerner
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Nasim Sheikh-Bahaei
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Nasim Sheikh-Bahaei, Keck School of Medicine, University of Southern California, 1520 San Pablo St, Lower Level Imaging L1451, Los Angeles, CA 90033, USA.
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