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Kharal GA, Ibrikji SE, Farag YM, Shoskes A, Kiczek MP, Sheth R, Hussain MS. Predictive Value of Clinical, CSF and Vessel Wall MRI Variables in Diagnosing Primary Angiitis of the CNS. Neurol Clin Pract 2024; 14:e200321. [PMID: 38855713 PMCID: PMC11160479 DOI: 10.1212/cpj.0000000000200321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Accepted: 04/02/2024] [Indexed: 06/11/2024]
Abstract
Background and Objectives Without brain biopsy, there are limited diagnostic predictors to differentiate primary angiitis of the CNS (PACNS) from intracranial atherosclerotic disease (ICAD). We examined the utility of clinical, CSF, and quantitative vessel wall magnetic resonance imaging (VWMRI) variables in predicting PACNS from ICAD. Methods In this cross-sectional design, observational study, we reviewed electronic medical records to identify patients (18 years and older) who presented to our medical center between January 2015 and December 2021 for ischemic stroke due to intracranial vasculopathy. Patients with biopsy-proven PACNS, probable PACNS, or ICAD were included. Patients with secondary CNS vasculitis or no VWMRI data were excluded. On VWMRI, for each patient, a total of 20 vessel wall segments were analyzed for percent concentricity, percent irregularity, and concentricity to eccentricity (C/E) ratios. We also collected several clinical and CSF variables. Using logistic regression models, we assessed the diagnostic value of VWMRI, CSF, and clinical variables in predicting PACNS in patients with biopsy-proven disease. We then performed a sensitivity analysis to assess predictors of biopsy-proven and probable PACNS. Results Thirty-two patients with ICAD (54.2%) and 27 patients with PACNS (45.8%) were included. Of the patients with PACNS, 21 (77.8%) were not biopsied and considered probable PACNS. Twenty-four patients with ICAD (75%) and 6 biopsy-proven patients with PACNS (22.2%) showed large vessel involvement and were included in the primary analysis. Encephalopathy (odds ratio [OR], 7.60; 95% CI 1.07-54.09) and seizure (OR 23.00; 95% CI 1.77-298.45) were significantly associated with PACNS. All patients were included in the sensitivity analysis, in which headache significantly predicted PACNS (OR 7.60; 95% CI 1.07-54.09). In the primary analysis, for every 1 white blood cell/µL increase in CSF, there was a 47% higher odds of PACNS (OR 1.47; 95% CI 1.04-2.07). On VWMRI, a C/E ratio >1 (OR 115.00; 95% CI 6.11-2165.95), percent concentricity ≥50% (OR 55.00; 95% CI 4.13-732.71), and percent irregularity <50% (OR 55.00; 95% CI 4.13-732.71) indicated significantly higher odds of PACNS compared with ICAD. Discussion Our results suggest that quantitative VWMRI metrics, CSF pleocytosis, and clinical features of encephalopathy, seizure, and headache significantly predict a diagnosis of probable PACNS when compared with ICAD.
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Affiliation(s)
- G Abbas Kharal
- Cerebrovascular Center (GAK, SEI, MSH), Neurological Institute, Cleveland Clinic, OH; Department of Epidemiology (YMF), Johns Hopkins Bloomberg School of Public Health, Baltimore, MD; Department of Neurology (AS), University of Utah, Salt Lake City; Section of Neuroradiology (MPK), Imaging Institute, Cleveland Clinic, OH; and Northeast Ohio Medical School (RS), Rootstown
| | - Sidonie E Ibrikji
- Cerebrovascular Center (GAK, SEI, MSH), Neurological Institute, Cleveland Clinic, OH; Department of Epidemiology (YMF), Johns Hopkins Bloomberg School of Public Health, Baltimore, MD; Department of Neurology (AS), University of Utah, Salt Lake City; Section of Neuroradiology (MPK), Imaging Institute, Cleveland Clinic, OH; and Northeast Ohio Medical School (RS), Rootstown
| | - Youssef M Farag
- Cerebrovascular Center (GAK, SEI, MSH), Neurological Institute, Cleveland Clinic, OH; Department of Epidemiology (YMF), Johns Hopkins Bloomberg School of Public Health, Baltimore, MD; Department of Neurology (AS), University of Utah, Salt Lake City; Section of Neuroradiology (MPK), Imaging Institute, Cleveland Clinic, OH; and Northeast Ohio Medical School (RS), Rootstown
| | - Aaron Shoskes
- Cerebrovascular Center (GAK, SEI, MSH), Neurological Institute, Cleveland Clinic, OH; Department of Epidemiology (YMF), Johns Hopkins Bloomberg School of Public Health, Baltimore, MD; Department of Neurology (AS), University of Utah, Salt Lake City; Section of Neuroradiology (MPK), Imaging Institute, Cleveland Clinic, OH; and Northeast Ohio Medical School (RS), Rootstown
| | - Matthew P Kiczek
- Cerebrovascular Center (GAK, SEI, MSH), Neurological Institute, Cleveland Clinic, OH; Department of Epidemiology (YMF), Johns Hopkins Bloomberg School of Public Health, Baltimore, MD; Department of Neurology (AS), University of Utah, Salt Lake City; Section of Neuroradiology (MPK), Imaging Institute, Cleveland Clinic, OH; and Northeast Ohio Medical School (RS), Rootstown
| | - Richa Sheth
- Cerebrovascular Center (GAK, SEI, MSH), Neurological Institute, Cleveland Clinic, OH; Department of Epidemiology (YMF), Johns Hopkins Bloomberg School of Public Health, Baltimore, MD; Department of Neurology (AS), University of Utah, Salt Lake City; Section of Neuroradiology (MPK), Imaging Institute, Cleveland Clinic, OH; and Northeast Ohio Medical School (RS), Rootstown
| | - Muhammad S Hussain
- Cerebrovascular Center (GAK, SEI, MSH), Neurological Institute, Cleveland Clinic, OH; Department of Epidemiology (YMF), Johns Hopkins Bloomberg School of Public Health, Baltimore, MD; Department of Neurology (AS), University of Utah, Salt Lake City; Section of Neuroradiology (MPK), Imaging Institute, Cleveland Clinic, OH; and Northeast Ohio Medical School (RS), Rootstown
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2
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Song JW, Frame MY, Sellers RT, Klahn C, Fitzgerald K, Pomponio B, Schnall MD, Kasner SE, Loevner LA. Implementation of a Clinical Vessel Wall MR Imaging Program at an Academic Medical Center. AJNR Am J Neuroradiol 2024; 45:554-561. [PMID: 38514091 PMCID: PMC11288535 DOI: 10.3174/ajnr.a8191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Accepted: 01/12/2024] [Indexed: 03/23/2024]
Abstract
BACKGROUND AND PURPOSE The slow adoption of new advanced imaging techniques into clinical practice has been a long-standing challenge. Principles of implementation science and the reach, effectiveness, adoption, implementation, maintenance (RE-AIM) framework were used to build a clinical vessel wall imaging program at an academic medical center. MATERIALS AND METHODS Six phases for implementing a clinical vessel wall MR imaging program were contextualized to the RE-AIM framework. Surveys were designed and distributed to MR imaging technologists and clinicians. Effectiveness was measured by surveying the perceived diagnostic value of vessel wall imaging among MR imaging technologists and clinicians, trends in case volumes in the clinical vessel wall imaging examination, and the number of coauthored vessel wall imaging-focused publications and abstracts. Adoption and implementation were measured by surveying stakeholders about workflow. Maintenance was measured by surveying MR imaging technologists on the value of teaching materials and online tip sheets. The Integration dimension was measured by the number of submitted research grants incorporating vessel wall imaging protocols. Feedback during the implementation phases and solicited through the survey is qualitatively summarized. Quantitative results are reported using descriptive statistics. RESULTS Six phases of the RE-AIM framework focused on the following: 1) determining patient and disease representation, 2) matching resource availability and patient access, 3) establishing vessel MR wall imaging (VWI) expertise, 4) forming interdisciplinary teams, 5) iteratively refining workflow, and 6) integrating for maintenance and scale. Survey response rates were 48.3% (MR imaging technologists) and 71.4% (clinicians). Survey results showed that 90% of the MR imaging technologists agreed that they understood how vessel wall MR imaging adds diagnostic value to patient care. Most clinicians (91.3%) reported that vessel wall MR imaging results changed their diagnostic confidence or patient management. Case volumes of clinical vessel wall MR imaging performed from 2019 to 2022 rose from 22 to 205 examinations. Workflow challenges reported by MR imaging technologists included protocoling examinations and scan length. Feedback from ordering clinicians included the need for education about VWI indications, limitations, and availability. During the 3-year implementation period of the program, the interdisciplinary teams coauthored 27 publications and abstracts and submitted 13 research grants. CONCLUSIONS Implementation of a clinical imaging program can be successful using the principles of the RE-AIM framework. Through iterative processes and the support of interdisciplinary teams, a vessel wall MR imaging program can be integrated through a dedicated clinical pipeline, add diagnostic value, support educational and research missions at an academic medical center, and become a center for excellence.
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Affiliation(s)
- Jae W Song
- From the Department of Radiology (J.W.S., M.Y.F., R.T.S., B.P., M.D.S., L.A.L.), Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Megan Y Frame
- From the Department of Radiology (J.W.S., M.Y.F., R.T.S., B.P., M.D.S., L.A.L.), Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Rob T Sellers
- From the Department of Radiology (J.W.S., M.Y.F., R.T.S., B.P., M.D.S., L.A.L.), Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Connie Klahn
- Department of Radiology, (C.K.), Penn Presbyterian Hospital, Philadelphia, Pennsylvania
| | - Kevin Fitzgerald
- Department of Radiology (K.F.), Penn Radnor, Philadelphia, Pennsylvania
| | - Bridget Pomponio
- From the Department of Radiology (J.W.S., M.Y.F., R.T.S., B.P., M.D.S., L.A.L.), Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Mitchell D Schnall
- From the Department of Radiology (J.W.S., M.Y.F., R.T.S., B.P., M.D.S., L.A.L.), Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Scott E Kasner
- Department of Neurology (S.E.K.), Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Laurie A Loevner
- From the Department of Radiology (J.W.S., M.Y.F., R.T.S., B.P., M.D.S., L.A.L.), Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
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3
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D’Aniello S, Rustici A, Gramegna LL, Godi C, Piccolo L, Gentile M, Zini A, Carrozzi A, Lodi R, Tonon C, Dall’Olio M, Simonetti L, Chieffo R, Anzalone N, Cirillo L. The Contribution of Vessel Wall Magnetic Resonance Imaging to the Diagnosis of Primary and Secondary Central Nervous System Vasculitis. Diagnostics (Basel) 2024; 14:927. [PMID: 38732340 PMCID: PMC11083696 DOI: 10.3390/diagnostics14090927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 04/11/2024] [Accepted: 04/24/2024] [Indexed: 05/13/2024] Open
Abstract
BACKGROUND To describe high-resolution brain vessel wall MRI (VW-MRI) patterns and morphological brain findings in central nervous system (CNS) vasculitis patients. METHODS Fourteen patients with confirmed CNS Vasculitis from two tertiary centers underwent VW-MRI using a 3T scanner. The images were reviewed by two neuroradiologists to assess vessel wall enhancement characteristics and locations. RESULTS Fourteen patients were included (six females; average age 48 ± 19 years). Diagnoses included primary CNS vasculitis (PCNSV) in six patients and secondary CNS vasculitis (SCNSV) in eight, half of which were infection-related. Thirteen patients showed vessel wall enhancement, which was intense in eleven patients (84.6%) and concentric in twelve (92.3%), affecting the anterior circulation in nine patients (69.2%), posterior in two patients (15.4%), and both circulations in two patients (15.4%). The enhancement patterns were similar across different CNS vasculitis types. DWI changes corresponded with areas of vessel wall enhancement in 77% of patients. Conclusions: CNS vasculitis is often associated with intense, concentric vessel wall enhancement in VW-MRI, especially in the anterior circulation. The consistent presence of DWI alterations in affected territories suggests a possible link to microembolization or hypoperfusion. These imaging findings complement parenchymal brain MRI and MRA/DSA data, potentially increasing the possibility of a clinical diagnosis of CNS vasculitis.
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Affiliation(s)
- Serena D’Aniello
- Department of Advanced Biomedical Science, University of Napoli “Federico II”, 80125 Naples, Italy
| | - Arianna Rustici
- Department of Biomedical and Neuromotor Sciences (DIBINEM), University of Bologna, 40138 Bologna, Italy
- Neuroradiology Unit, IRCCS Istituto delle Scienze Neurologiche di Bologna, Ospedale Maggiore, 40133 Bologna, Italy
| | - Laura Ludovica Gramegna
- Vall d’Hebron Research Institute, Vall d’Hebron Barcelona Hospital Campus, 08035 Barcelona, Spain
- Servicio de Radiología, Unidad de Neuroradiología, Hospital del Mar, 08003 Barcelona, Spain
| | - Claudia Godi
- Neuroradiology Unit and CERMAC, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy
- Neuroradiology Unit, Sant’Antonio Abate Hospital, ASST Valle Olona, 21013 Gallarate, Italy
| | - Laura Piccolo
- Neurology and Stroke Center, IRCCS Istituto delle Scienze Neurologiche di Bologna, Ospedale Maggiore, 40133 Bologna, Italy
| | - Mauro Gentile
- Neurology and Stroke Center, IRCCS Istituto delle Scienze Neurologiche di Bologna, Ospedale Maggiore, 40133 Bologna, Italy
| | - Andrea Zini
- Neurology and Stroke Center, IRCCS Istituto delle Scienze Neurologiche di Bologna, Ospedale Maggiore, 40133 Bologna, Italy
| | - Alessandro Carrozzi
- Department of Medical and Surgical Sciences (DIMEC), University of Bologna, 40138 Bologna, Italy
| | - Raffaele Lodi
- Department of Biomedical and Neuromotor Sciences (DIBINEM), University of Bologna, 40138 Bologna, Italy
- Functional and Molecular Neuroimaging Unit, IRCCS Istituto delle Scienze Neurologiche di Bologna, 40123 Bologna, Italy
| | - Caterina Tonon
- Department of Biomedical and Neuromotor Sciences (DIBINEM), University of Bologna, 40138 Bologna, Italy
- Functional and Molecular Neuroimaging Unit, IRCCS Istituto delle Scienze Neurologiche di Bologna, 40123 Bologna, Italy
| | - Massimo Dall’Olio
- Neuroradiology Unit, IRCCS Istituto delle Scienze Neurologiche di Bologna, Ospedale Bellaria, 40139 Bologna, Italy
| | - Luigi Simonetti
- Neuroradiology Unit, IRCCS Istituto delle Scienze Neurologiche di Bologna, Ospedale Maggiore, 40133 Bologna, Italy
| | - Raffaella Chieffo
- Experimental Neurophysiology Unit, IRCCS San Raffaele, Institute of Experimental Neurology (INSPE), 20132 Milan, Italy
| | - Nicoletta Anzalone
- Neuroradiology Unit and CERMAC, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy
| | - Luigi Cirillo
- Department of Biomedical and Neuromotor Sciences (DIBINEM), University of Bologna, 40138 Bologna, Italy
- Functional and Molecular Neuroimaging Unit, IRCCS Istituto delle Scienze Neurologiche di Bologna, 40123 Bologna, Italy
- Neuroradiology Unit, IRCCS Istituto delle Scienze Neurologiche di Bologna, Ospedale Bellaria, 40139 Bologna, Italy
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Sherri A, Mortada MM, Makowska J, Lewandowska-Polak A. Primary angiitis of the CNS and ANCA-associated vasculitis: from pathology to treatment. Rheumatol Int 2024; 44:211-222. [PMID: 37777632 PMCID: PMC10796583 DOI: 10.1007/s00296-023-05461-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 09/03/2023] [Indexed: 10/02/2023]
Abstract
Vasculitis of the central nervous system can be a localized process, such as primary angiitis of the central nervous system (PACNS), or systemic vasculitis, such as ANCA-associated vasculitis (AAV). Since both conditions share neurological manifestations, the following review will discuss the neurological aspects of both. This review aims to provide a comprehensive comparison of the pathogenesis, clinical manifestation and assessment, diagnostic workup, and treatment protocol for both PACNS and AAV with central nervous system involvement. To provide a comprehensive comparison and update, a literature review was conducted using PubMed and Ovid databases (Embase and Medline). Then, the references were retrieved, screened, and selected according to the inclusion and exclusion criteria. PACNS and AAV share similarities in clinical presentation and neurological symptoms, especially in terms of headache, focal deficits, and cognitive impairment. Additionally, both conditions may exhibit similarities in laboratory and radiological findings, making brain biopsy the gold standard for differentiation between the two conditions. Moreover, the treatment protocols for PACNS and AAV are nearly identical. Comparing PACNS and AAV with CNS involvement highlights the similarities in clinical presentation, radiological findings, and treatment protocols between the two conditions. Further research should focus on establishing a practical diagnostic protocol.
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Affiliation(s)
- Alaa Sherri
- Department of Rheumatology, Medical University of Lodz, Łódź, Poland.
| | | | - Joanna Makowska
- Department of Rheumatology, Medical University of Lodz, Łódź, Poland
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5
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Pascarella R, Antonenko K, Boulouis G, De Boysson H, Giannini C, Heldner MR, Kargiotis O, Nguyen TN, Rice CM, Salvarani C, Schmidt-Pogoda A, Strbian D, Hussain S, Zedde M. European Stroke Organisation (ESO) guidelines on Primary Angiitis of the Central Nervous System (PACNS). Eur Stroke J 2023; 8:842-879. [PMID: 37903069 PMCID: PMC10683718 DOI: 10.1177/23969873231190431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 07/11/2023] [Indexed: 11/01/2023] Open
Abstract
The European Stroke Organisation (ESO) guideline on Primary Angiitis of the Central Nervous System (PACNS), developed according to ESO standard operating procedures (SOP) and Grading of Recommendations, Assessment, Development and Evaluation (GRADE) methodology, was elaborated to assist clinicians in the diagnostic and treatment pathway of patients with PACNS in their decision making. A working group involving vascular neurologists, neuroradiologists, rheumatologists, a neuropathologist and a methodologist identified 17 relevant clinical questions; these were addressed according to the patient/population, intervention, comparison and outcomes (PICO) framework and systematic literature reviews were performed. Notably, each PICO was addressed with respect to large vessel (LV)-PACNS and small vessel (SV)-PACNS. Data to answer many questions were scarce or lacking and the quality of evidence was very low overall, so, for some PICOs, the recommendations reflect the ongoing uncertainty. When the absence of sufficient evidence precluded recommendations, Expert Consensus Statements were formulated. In some cases, this applied to interventions in the diagnosis and treatment of PACNS which are embedded widely in clinical practice, for example patterns of cerebrospinal fluid (CSF) and Magnetic Resonance Imaging (MRI) abnormalities. CSF analysis for hyperproteinorrachia and pleocytosis does not have evidence supporting their use as diagnostic tools. The working group recommended that caution is employed in the interpretation of non-invasive vascular imaging due to lack of validation and the different sensitivities in comparison with digital subtraction angiography (DSA) and histopathological analyses. Moreover, there is not a neuroimaging pattern specific for PACNS and neurovascular issues are largely underreported in PACNS patients. The group's recommendations on induction and maintenance of treatment and for primary or secondary prevention of vascular events also reflect uncertainty due to lack of evidence. Being uncertain the role and practical usefulness of current diagnostic criteria and being not comparable the main treatment strategies, it is suggested to have a multidisciplinary team approach in an expert center during both work up and management of patients with suspected PACNS. Highlighting the limitations of the currently accepted diagnostic criteria, we hope to facilitate the design of multicenter, prospective clinical studies and trials. A standardization of neuroimaging techniques and reporting to improve the level of evidence underpinning interventions employed in the diagnosis and management of PACNS. We anticipate that this guideline, the first comprehensive European guideline on PACNS management using GRADE methodology, will assist clinicians to choose the most effective management strategy for PACNS.
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Affiliation(s)
- Rosario Pascarella
- Neuroradiology Unit, Azienda Unità Sanitaria Locale-IRCCS di Reggio Emilia, Reggio Emilia, Italy
| | - Katherina Antonenko
- Department of Neurology, University Hospital and University of Bern, Bern, Switzerland
| | - Grégoire Boulouis
- Neuroradiology - Diagnostic and Interventional Neuroradiology, CIC-IT 1415, INSERM 1253 iBrain, Tours University Hospital, Centre Val de Loire Region, France
| | - Hubert De Boysson
- Service de Médecine Interne, CHU de Caen, Avenue de la Côte de Nacre, Caen, France; Université Caen Normandie, Caen, France
| | - Caterina Giannini
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Mirjam R Heldner
- Department of Neurology, University Hospital and University of Bern, Bern, Switzerland
| | - Odysseas Kargiotis
- Stroke Unit, Metropolitan Hospital, Ethnarchou Makariou 9, Piraeus, Greece
| | - Thanh N Nguyen
- Neurology, Radiology, Boston Medical Center, Boston University Chobanian and Avedisian School of Medicine, Boston, MA, USA
| | - Claire M Rice
- Neurology, Translational Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
- Department of Neurology, Southmead Hospital, North Bristol NHS Trust, Bristol, UK
| | - Carlo Salvarani
- Rheumatology, Rheumatology Unit, Azienda Ospedaliera-IRCCS di Reggio Emilia and Università di Modena e Reggio Emilia, Reggio Emilia, Italy
| | - Antje Schmidt-Pogoda
- Department of Neurology with Institute of Translational Neurology, Münster University Hospital, Albert-Schweitzer-Campus 1, Münster, Germany
| | - Daniel Strbian
- Department of Neurology, Helsinki University Central Hospital HUCH, Helsinki, Finland
| | | | - Marialuisa Zedde
- Neurology Unit, Stroke Unit, Azienda Unità Sanitaria Locale-IRCCS di Reggio Emilia, Reggio Emilia, Italy
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Eisenmenger LB, Spahic A, McNally JS, Johnson KM, Song JW, Junn JC. MR Imaging for Intracranial Vessel Wall Imaging: Pearls and Pitfalls. Magn Reson Imaging Clin N Am 2023; 31:461-474. [PMID: 37414472 DOI: 10.1016/j.mric.2023.04.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/08/2023]
Abstract
Conventional vascular imaging methods have primarily focused on evaluating the vascular lumen. However, these techniques are not intended to evaluate vessel wall abnormalities where many cerebrovascular pathologies reside. With increased interest for the visualization and study of the vessel wall, high-resolution vessel wall imaging (VWI) has gained traction.Over the past two decades, there has been a rapid increase in number of VWI publications with improvements in imaging techniques and expansion on clinical applications. With increasing utility and interest in VWI, application of proper protocols and understanding imaging characteristics of vasculopathies are important for the interpreting radiologists to understand.
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Affiliation(s)
- Laura B Eisenmenger
- University of Wisconsin - Madison, 1111 Highland Avenue, Madison, WI 53705, USA.
| | - Alma Spahic
- University of Wisconsin - Madison, 1111 Highland Avenue, Madison, WI 53705, USA
| | | | - Kevin M Johnson
- University of Wisconsin - Madison, 1111 Highland Avenue, Madison, WI 53705, USA
| | - Jae W Song
- University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104, USA
| | - Jacqueline C Junn
- Icahn School of Medicine at Mount Sinai, 1 Gustave Levy Place, Box 1234, New York City, NY 10029, USA
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7
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Corrêa DG, Pacheco FT, da Cruz LCH, Nunes RH, Maia ACM, de Souza Godoy LF, Bisolo L, da Silva NA, Soldatelli MD, de Siqueira Campos CM, Vedolin LM, do Amaral LLF, da Rocha AJ. Intracranial vessel wall magnetic resonance imaging features of infectious vasculitis. Clin Imaging 2023; 98:26-35. [PMID: 36996597 DOI: 10.1016/j.clinimag.2023.03.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 02/19/2023] [Accepted: 03/21/2023] [Indexed: 03/31/2023]
Abstract
Vasculitis is a complication of several infectious diseases affecting the central nervous system, which may result in ischemic and/or hemorrhagic stroke, transient ischemic attack, and aneurysm formation. The infectious agent may directly infect the endothelium, causing vasculitis, or indirectly affect the vessel wall through an immunological mechanism. The clinical manifestations of these complications usually overlap with those of non-infectious vascular diseases, making diagnosis challenging. Intracranial vessel wall magnetic resonance imaging (VWI) enables the evaluation of the vessel wall and the diseases that affect it, providing diagnostic data beyond luminal changes and enabling the identification of inflammatory changes in cerebral vasculitis. This technique demonstrates concentric vessel wall thickening and gadolinium enhancement, associated or not with adjacent brain parenchymal enhancement, in patients with vasculitis of any origin. It permits the detection of early alterations, even before a stenosis occurs. In this article, we review the intracranial vessel wall imaging features of infectious vasculitis of bacterial, viral, and fungal etiologies.
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Affiliation(s)
- Diogo Goulart Corrêa
- Department of Radiology, Clínica de Diagnóstico por Imagem (CDPI)/DASA, Rio de Janeiro, RJ, Brazil; Department of Radiology, Federal Fluminense University, Niterói, RJ, Brazil.
| | - Felipe Torres Pacheco
- Department of Neuroradiology, Irmandade da Santa Casa de Misericórdia de São Paulo, São Paulo, SP, Brazil; Department of Radiology, DASA, São Paulo, SP, Brazil
| | | | - Renato Hoffmann Nunes
- Department of Neuroradiology, Irmandade da Santa Casa de Misericórdia de São Paulo, São Paulo, SP, Brazil; Department of Radiology, DASA, São Paulo, SP, Brazil
| | - Antônio Carlos Martins Maia
- Department of Neuroradiology, Irmandade da Santa Casa de Misericórdia de São Paulo, São Paulo, SP, Brazil; Department of Radiology, Fleury, São Paulo, SP, Brazil
| | | | - Louise Bisolo
- Department of Radiology, Hospital Israelita Albert Einstein, São Paulo, SP, Brazil
| | - Nivaldo Adolfo da Silva
- Department of Radiology, DASA, São Paulo, SP, Brazil; Department of Radiology, University of Campinas, Campinas, SP, Brazil
| | | | | | - Leonardo Modesti Vedolin
- Department of Radiology, DASA, São Paulo, SP, Brazil; Department of Radiology, Hospital de Clínicas de Porta Alegre, Porto Alegre, RS, Brazil
| | | | - Antônio José da Rocha
- Department of Neuroradiology, Irmandade da Santa Casa de Misericórdia de São Paulo, São Paulo, SP, Brazil; Department of Radiology, DASA, São Paulo, SP, Brazil
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8
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Bilodeau PA, Aghajan Y, Izzy S. Rash, Facial Droop, and Multifocal Intracranial Stenosis Due to Varicella Zoster Virus Vasculitis. Neurohospitalist 2023; 13:178-182. [PMID: 37064929 PMCID: PMC10091438 DOI: 10.1177/19418744221150301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023] Open
Abstract
Background: This is a case of multifocal intracranial stenosis in a 74 year old male ultimately discovered to be due to Varicella Zoster Virus infection. Purpose: We highlight the importance of a broad differential diagnosis, even when the most likely etiology of intracranial stenosis is atherosclerosis. Our paper reviews the differential diagnosis as well as "red flags" for intracranial vasculopathy. Even though intracranial atherosclerotic disease is the most common cause of vasculopathy, infectious or inflammatory vasculitis should be considered on the differential. Conclusions: Before considering bypass surgery or other invasive neurosurgical procedures, ensure reversible causes of vasculopathy have been ruled out. The presence of cranial neuropathies, rash, and/or elevated inflammatory markers should be red flags for vasculitis in patients presenting with stroke.
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Affiliation(s)
| | | | - Saef Izzy
- Brigham and Women's
Hospital, Boston, MA, USA
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9
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Yoshii S, Fukui R, Hattori S, Yamaguchi R, Fujimoto R, Aoyama H, Omata T. MR vessel wall enhancement in a pediatric focal cerebral arteriopathy. Brain Dev 2023; 45:354-359. [PMID: 36806407 DOI: 10.1016/j.braindev.2023.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 01/22/2023] [Accepted: 02/05/2023] [Indexed: 02/19/2023]
Abstract
BACKGROUND Focal cerebral arteriopathy (FCA) is a common cause of childhood arterial ischemic stroke in previously healthy children. Although its mechanisms are poorly understood, recent studies have suggested inflammatory processes. Magnetic resonance vessel wall imaging (VWI) is a potential imaging biomarker of inflammation. CASE DESCRIPTION We describe the case of a 7-year-old Japanese girl with right hemiplegia and dysarthria for 3 days. Brain MRI showed acute infarct in the left basal ganglia, and MRA and conventional cerebral angiogram detected vascular stenosis in the left distal internal carotid artery, left M1 and A1 segments. VWI revealed marked vessel wall enhancement and thickening in the left carotid artery, M1, and A2 segments. Based on imaging findings, she was diagnosed with acute ischemic stroke caused by FCA. Because VWI findings were thought to suggest vessel wall inflammation, high-dose steroid therapy was administered in addition to neuroprotective care and antithrombotic therapy. Although her clinical symptoms improved immediately, cerebral arteriopathy worsened on MRA a month after the onset. Subsequently, after 3 months of steroid therapy, vessel wall enhancement on VWI decreased, while arterial stenosis partially improved. At the follow-up 9 months after the onset, she had no recurrent stroke, her arteriopathy had stabilized. DISCUSSION Definitive evidence of inflammatory mechanisms in FCA is limited, and appropriate management and treatment strategies for FCA are undefined. VWI attempts to demonstrate pathologic processes within the vessel wall, and reversible wall enhancement observed in our patient suggested the presence of inflammation. VWI would help in the evaluation of disease activity in FCA. CONCLUSION VWI may contribute to the appropriate diagnosis and treatment for FCA to reflect active inflammation. Further work is needed to assess the utility of VWI in pediatric FCA.
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Affiliation(s)
- Shoko Yoshii
- Division of Child Neurology, Chiba Children's Hospital, Chiba, Japan
| | - Rina Fukui
- Department of Radiology, Chiba Children's Hospital, Chiba, Japan
| | - Shinya Hattori
- Department of Radiology, Chiba University Hospital, Chiba, Japan
| | - Ryo Yamaguchi
- Division of Child Neurology, Chiba Children's Hospital, Chiba, Japan
| | - Ryo Fujimoto
- Division of Child Neurology, Chiba Children's Hospital, Chiba, Japan
| | - Hiromi Aoyama
- Division of Child Neurology, Chiba Children's Hospital, Chiba, Japan
| | - Taku Omata
- Division of Child Neurology, Chiba Children's Hospital, Chiba, Japan.
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10
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Jiang B, Mackay MT, Stence N, Domi T, Dlamini N, Lo W, Wintermark M. Neuroimaging in Pediatric Stroke. Semin Pediatr Neurol 2022; 43:100989. [PMID: 36344022 DOI: 10.1016/j.spen.2022.100989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 08/09/2022] [Accepted: 08/10/2022] [Indexed: 11/30/2022]
Abstract
Pediatric stroke is unfortunately not a rare condition. It is associated with severe disability and mortality because of the complexity of potential clinical manifestations, and the resulting delay in seeking care and in diagnosis. Neuroimaging plays an important role in the multidisciplinary response for pediatric stroke patients. The rapid development of adult endovascular thrombectomy has created a new momentum in health professionals caring for pediatric stroke patients. Neuroimaging is critical to make decisions of identifying appropriate candidates for thrombectomy. This review article will review current neuroimaging techniques, imaging work-up strategies and special considerations in pediatric stroke. For resources limited areas, recommendation of substitute imaging approaches will be provided. Finally, promising new techniques and hypothesis-driven research protocols will be discussed.
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Affiliation(s)
- Bin Jiang
- Department of Radiology, Neuroradiology Section, Stanford University, Stanford, CA.
| | - Mark T Mackay
- Murdoch Children's Research Institute, Royal Children's Hospital and Department of Paediatrics, University of Melbourne, Victoria, Australia.
| | - Nicholas Stence
- Department of Radiology, pediatric Neuroradiology Section, University of Colorado School of Medicine, Aurora, CO
| | - Trish Domi
- Department of Neurology, Hospital for Sick Children, Toronto, Canada.
| | - Nomazulu Dlamini
- Department of Neurology, Hospital for Sick Children, Toronto, Canada.
| | - Warren Lo
- Department of Pediatrics and Neurology, The Ohio State University & Nationwide Children's Hospital, Columbus, OH.
| | - Max Wintermark
- Department of Neuroradiology, University of Texas MD Anderson Center, Houston, TX.
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11
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Abstract
Vessel wall MR imaging (VW-MRI) has been introduced into clinical practice and applied to a variety of diseases, and its usefulness has been reported. High-resolution VW-MRI is essential in the diagnostic workup and provides more information than other routine MR imaging protocols. VW-MRI is useful in assessing lesion location, morphology, and severity. Additional information, such as vessel wall enhancement, which is useful in the differential diagnosis of atherosclerotic disease and vasculitis could be assessed by this special imaging technique. This review describes the VW-MRI technique and its clinical applications in arterial disease, venous disease, vasculitis, and leptomeningeal disease.
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12
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Sakai Y, Lehman VT, Eisenmenger LB, Obusez EC, Kharal GA, Xiao J, Wang GJ, Fan Z, Cucchiara BL, Song JW. Vessel wall MR imaging of aortic arch, cervical carotid and intracranial arteries in patients with embolic stroke of undetermined source: A narrative review. Front Neurol 2022; 13:968390. [PMID: 35968273 PMCID: PMC9366886 DOI: 10.3389/fneur.2022.968390] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 07/01/2022] [Indexed: 11/13/2022] Open
Abstract
Despite advancements in multi-modal imaging techniques, a substantial portion of ischemic stroke patients today remain without a diagnosed etiology after conventional workup. Based on existing diagnostic criteria, these ischemic stroke patients are subcategorized into having cryptogenic stroke (CS) or embolic stroke of undetermined source (ESUS). There is growing evidence that in these patients, non-cardiogenic embolic sources, in particular non-stenosing atherosclerotic plaque, may have significant contributory roles in their ischemic strokes. Recent advancements in vessel wall MRI (VW-MRI) have enabled imaging of vessel walls beyond the degree of luminal stenosis, and allows further characterization of atherosclerotic plaque components. Using this imaging technique, we are able to identify potential imaging biomarkers of vulnerable atherosclerotic plaques such as intraplaque hemorrhage, lipid rich necrotic core, and thin or ruptured fibrous caps. This review focuses on the existing evidence on the advantages of utilizing VW-MRI in ischemic stroke patients to identify culprit plaques in key anatomical areas, namely the cervical carotid arteries, intracranial arteries, and the aortic arch. For each anatomical area, the literature on potential imaging biomarkers of vulnerable plaques on VW-MRI as well as the VW-MRI literature in ESUS and CS patients are reviewed. Future directions on further elucidating ESUS and CS by the use of VW-MRI as well as exciting emerging techniques are reviewed.
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Affiliation(s)
- Yu Sakai
- Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia, PA, United States
| | - Vance T. Lehman
- Department of Radiology, The Mayo Clinic, Rochester, MN, United States
| | - Laura B. Eisenmenger
- Department of Radiology, University of Wisconsin-Madison, Madison, WI, United States
| | | | - G. Abbas Kharal
- Department of Neurology, Cerebrovascular Center, Neurological Institute, Cleveland, OH, United States
| | - Jiayu Xiao
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Grace J. Wang
- Department of Vascular Surgery and Endovascular Therapy, Hospital of the University of Pennsylvania, Philadelphia, PA, United States
| | - Zhaoyang Fan
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Brett L. Cucchiara
- Department of Neurology, Hospital of the University of Pennsylvania, Philadelphia, PA, United States
| | - Jae W. Song
- Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia, PA, United States
- *Correspondence: Jae W. Song
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13
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7T MRI for Intracranial Vessel Wall Lesions and Its Associated Neurological Disorders: A Systematic Review. Brain Sci 2022; 12:brainsci12050528. [PMID: 35624915 PMCID: PMC9139315 DOI: 10.3390/brainsci12050528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 03/16/2022] [Accepted: 04/20/2022] [Indexed: 11/24/2022] Open
Abstract
Intracranial vessel wall lesions are involved in a variety of neurological diseases. The advanced technique 7T MRI provides greater efficacy in the diagnosis of the pathology changes in the vessel wall and helps to identify potential subtle lesions. The purpose of this literature review was to systematically describe and evaluate the existing literature focusing on the use of 7T MRI in the detection and characterization of intracranial vessel wall lesions and their associated neurological disorders, to highlight the current knowledge gaps, and to formulate a framework to guide future applications and investigations. We systematically reviewed the existing articles up to July 2021, seeking the studies that assessed intracranial vessel wall lesions and their associated neurological disorders using 7T MRI. The literature search provided 12 studies that met the inclusion criteria. The most common intracranial vessel wall lesions were changes related to intracranial atherosclerosis (n = 8) and aneurysms (n = 4), such as intracranial atherosclerosis burden and aneurysm wall enhancement. The associated neurological disorders included aneurysms, ischemic stroke or TIA, small vessel disease, cognitive decline, and extracranial atherosclerosis. No paper studied the use of 7T MRI for investigating vessel wall conditions such as moyamoya disease, small vessel disease, or neurological disorders related to central nervous vasculitis. In conclusion, the novel 7T MRI enables the identification of a wider spectrum of subtle changes and associations. Future research on cerebral vascular diseases other than intracranial atherosclerosis and aneurysms may also benefit from 7T MRI.
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14
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Mazzacane F, Mazzoleni V, Scola E, Mancini S, Lombardo I, Busto G, Rognone E, Pichiecchio A, Padovani A, Morotti A, Fainardi E. Vessel Wall Magnetic Resonance Imaging in Cerebrovascular Diseases. Diagnostics (Basel) 2022; 12:diagnostics12020258. [PMID: 35204348 PMCID: PMC8871392 DOI: 10.3390/diagnostics12020258] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 01/08/2022] [Accepted: 01/14/2022] [Indexed: 01/27/2023] Open
Abstract
Cerebrovascular diseases are a leading cause of disability and death worldwide. The definition of stroke etiology is mandatory to predict outcome and guide therapeutic decisions. The diagnosis of pathological processes involving intracranial arteries is especially challenging, and the visualization of intracranial arteries’ vessel walls is not possible with routine imaging techniques. Vessel wall magnetic resonance imaging (VW-MRI) uses high-resolution, multiparametric MRI sequences to directly visualize intracranial arteries walls and their pathological alterations, allowing a better characterization of their pathology. VW-MRI demonstrated a wide range of clinical applications in acute cerebrovascular disease. Above all, it can be of great utility in the differential diagnosis of atherosclerotic and non-atherosclerotic intracranial vasculopathies. Additionally, it can be useful in the risk stratification of intracranial atherosclerotic lesions and to assess the risk of rupture of intracranial aneurysms. Recent advances in MRI technology made it more available, but larger studies are still needed to maximize its use in daily clinical practice.
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Affiliation(s)
- Federico Mazzacane
- Department of Emergency Neurology and Stroke Unit, IRCCS Mondino Foundation, 27100 Pavia, Italy;
- Department of Brain and Behavioral Sciences, University of Pavia, 27100 Pavia, Italy;
| | - Valentina Mazzoleni
- Neurology Unit, Department of Clinical and Experimental Sciences, University of Brescia, 25121 Brescia, Italy; (V.M.); (A.P.)
- Neurology Unit, Department of Neurological Sciences and Vision, ASST-Spedali Civili, 25123 Brescia, Italy;
| | - Elisa Scola
- Neuroradiology Unit, Department of Radiology, Careggi University Hospital, 50134 Florence, Italy; (E.S.); (S.M.); (I.L.); (G.B.)
| | - Sara Mancini
- Neuroradiology Unit, Department of Radiology, Careggi University Hospital, 50134 Florence, Italy; (E.S.); (S.M.); (I.L.); (G.B.)
| | - Ivano Lombardo
- Neuroradiology Unit, Department of Radiology, Careggi University Hospital, 50134 Florence, Italy; (E.S.); (S.M.); (I.L.); (G.B.)
| | - Giorgio Busto
- Neuroradiology Unit, Department of Radiology, Careggi University Hospital, 50134 Florence, Italy; (E.S.); (S.M.); (I.L.); (G.B.)
| | - Elisa Rognone
- Department of Neuroradiology, IRCCS Mondino Foundation, 27100 Pavia, Italy;
| | - Anna Pichiecchio
- Department of Brain and Behavioral Sciences, University of Pavia, 27100 Pavia, Italy;
- Department of Neuroradiology, IRCCS Mondino Foundation, 27100 Pavia, Italy;
| | - Alessandro Padovani
- Neurology Unit, Department of Clinical and Experimental Sciences, University of Brescia, 25121 Brescia, Italy; (V.M.); (A.P.)
- Neurology Unit, Department of Neurological Sciences and Vision, ASST-Spedali Civili, 25123 Brescia, Italy;
| | - Andrea Morotti
- Neurology Unit, Department of Neurological Sciences and Vision, ASST-Spedali Civili, 25123 Brescia, Italy;
| | - Enrico Fainardi
- Neuroradiology Unit, Department of Experimental and Clinical Biomedical Sciences “Mario Serio”, University of Florence, 50121 Florence, Italy
- Correspondence:
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15
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Patil A, Goldust M, Wollina U. Herpes zoster: A Review of Clinical Manifestations and Management. Viruses 2022; 14:192. [PMID: 35215786 PMCID: PMC8876683 DOI: 10.3390/v14020192] [Citation(s) in RCA: 127] [Impact Index Per Article: 63.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 01/14/2022] [Accepted: 01/17/2022] [Indexed: 01/27/2023] Open
Abstract
The Varicella-zoster virus (VZV) or human herpes virus 3 is a neurotropic human alpha herpes virus responsible for chickenpox/varicella and shingles/Herpes zoster (HZ). This review will focus on HZ. Since HZ is secondary to varicella, its incidence increases with age. In children and youngsters, HZ is rare and associated to metabolic and neoplastic disorders. In adults, advanced age, distress, other infections (such as AIDS or COVID-19), and immunosuppression are the most common risk factors. HZ reactivation has recently been observed after COVID-19 vaccination. The disease shows different clinical stages of variable clinical manifestations. Some of the manifestations bear a higher risk of complications. Among the possible complications, postherpetic neuralgia, a chronic pain disease, is one of the most frequent. HZ vasculitis is associated with morbidity and mortality. Renal and gastrointestinal complications have been reported. The cornerstone of treatment is early intervention with acyclovir or brivudine. Second-line treatments are available. Pain management is essential. For (secondary) prophylaxis, currently two HZV vaccines are available for healthy older adults, a live attenuated VZV vaccine and a recombinant adjuvanted VZV glycoprotein E subunit vaccine. The latter allows vaccination also in severely immunosuppressed patients. This review focuses on manifestations of HZ and its management. Although several articles have been published on HZ, the literature continues to evolve, especially in regard to patients with comorbidities and immunocompromised patients. VZV reactivation has also emerged as an important point of discussion during the COVID-19 pandemic, especially after vaccination. The objective of this review is to discuss current updates related to clinical presentations, complications, and management of HZ.
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Affiliation(s)
- Anant Patil
- Department of Pharmacology, Dr. DY Patil Medical College, Navi Mumbai 400706, India;
| | - Mohamad Goldust
- Department of Dermatology, University Medical Center, Johannes Gutenberg University, 55131 Mainz, Germany;
| | - Uwe Wollina
- Department of Dermatology and Allergology, Städtisches Klinikum Dresden, 01067 Dresden, Germany
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16
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Mattay RR, Saucedo JF, Lehman VT, Xiao J, Obusez EC, Raymond SB, Fan Z, Song JW. Current Clinical Applications of Intracranial Vessel Wall MR Imaging. Semin Ultrasound CT MR 2021; 42:463-473. [PMID: 34537115 DOI: 10.1053/j.sult.2021.07.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Intracranial vessel wall MR imaging (VWI) is increasingly being used as a valuable adjunct to conventional angiographic imaging techniques. This article will provide an updated review on intracranial VWI protocols and image interpretation. We review VWI technical considerations, describe common VWI imaging features of different intracranial vasculopathies and show illustrative cases. We review the role of VWI for differentiating among steno-occlusive vasculopathies, such as intracranial atherosclerotic plaque, dissections and Moyamoya disease. We also highlight how VWI may be used for the diagnostic work-up and surveillance of patients with vasculitis of the central nervous system and cerebral aneurysms.
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Affiliation(s)
- Raghav R Mattay
- Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia, PA
| | - Jose F Saucedo
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
| | | | - Jiayu Xiao
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA
| | | | - Scott B Raymond
- Department of Radiology, University of Vermont Medical Center, Burlington, VT
| | - Zhaoyang Fan
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA
| | - Jae W Song
- Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia, PA.
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