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Yoon NY, Ha DH, Lee SM, Choi HJ. Diffusion-Weighted MR Neurography with Unidirectional Motion-Probing Gradient to Evaluate Lumbar Nerve Roots at 1.5T MR. JOURNAL OF THE KOREAN SOCIETY OF RADIOLOGY 2024; 85:607-617. [PMID: 38873379 PMCID: PMC11166579 DOI: 10.3348/jksr.2023.0052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 09/27/2023] [Accepted: 10/25/2023] [Indexed: 06/15/2024]
Abstract
Purpose Recent studies have demonstrated the usefulness of diffusion-weighted MR neurography (DW MRN) for assessing nerve roots. This study aimed to evaluate the utility of DW MRN with a unidirectional motion-probing gradient (MPG) for the lumbar nerve roots at 1.5T MR. Materials and Methods Sixty-four lumbar spine MRI scans with DW MRN using anteroposterior unidirectional MPG were retrospectively analyzed. Any changes in the 512 lumbar spinal nerve roots from L3 to S1 were evaluated using T2-weighted imaging (T2WI), contrast-enhanced T1-weighted imaging (CE T1WI), and DW MRN, with agreement and correlation analysis. Results T2WI revealed compression of 78 nerve roots, and CE T1WI revealed 52 instances of nerve root enhancement. Sixty-seven nerve roots showed swelling and hyperintensity on DW MRN. A total of 42 nerve roots showed changes in the CE T1WI and DW MRN sequences. Moderate to substantial agreement and moderate positive correlation were observed between DW MRN and CE T1WI, as well as DW MRN and T2WI (κ = 0.59-0.65, ρ = 0.600-0.653). Conclusion DW MRN with unidirectional anteroposterior MPG can help evaluate neuritis-related changes in spinal nerve roots and could serve as a sequence capable of complementing or substituting gadolinium CE imaging.
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Tu W, Gottumukkala RV, Schieda N, Lavallée L, Adam BA, Silverman SG. Perineural Invasion and Spread in Common Abdominopelvic Diseases: Imaging Diagnosis and Clinical Significance. Radiographics 2023; 43:e220148. [PMID: 37319024 DOI: 10.1148/rg.220148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Malignancies and other diseases may spread by multiple pathways, including direct extension, hematogenous spread, or via lymphatic vessels. A less-well-understood route is the peripheral nervous system, which is known as perineural spread (PNS). In addition to accounting for pain and other neurologic symptoms, PNS affects both disease prognosis and management. Although PNS is commonly discussed in relation to head and neck tumors, there is emerging data regarding PNS in abdominopelvic malignancies and other conditions such as endometriosis. Due to improved contrast and spatial resolution, perineural invasion, a finding heretofore diagnosed only at pathologic examination, can be detected at CT, MRI, and PET/CT. PNS most commonly manifests as abnormal soft-tissue attenuation extending along neural structures, and diagnosis of it is aided by optimizing imaging parameters, understanding pertinent anatomy, and becoming familiar with the typical neural pathways of spread that largely depend on the disease type and location. In the abdomen, the celiac plexus is a central structure that innervates the major abdominal organs and is the principal route of PNS in patients with pancreatic and biliary carcinomas. In the pelvis, the lumbosacral plexus and inferior hypogastric plexus are the central structures and principal routes of PNS in patients with pelvic malignancies. Although the imaging findings of PNS may be subtle, a radiologic diagnosis can have a substantial effect on patient care. Knowledge of anatomy and known routes of PNS and optimizing imaging parameters is of utmost importance in providing key information for prognosis and treatment planning. © RSNA, 2023 Supplemental material and the slide presentation from the RSNA Annual Meeting are available for this article. Quiz questions for this article are available through the Online Learning Center.
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Affiliation(s)
- Wendy Tu
- From the Department of Radiology and Diagnostic Imaging (W.T.) and Department of Laboratory Medicine and Pathology (B.A.A.), University of Alberta, 116 St & 85 Ave, Edmonton, AB, Canada T6G 2R3; Department of Radiology, Brigham and Women's Hospital, Harvard University, Boston, Mass (R.V.G., S.G.S.); and Departments of Radiology (N.S.) and Urology (L.L.), University of Ottawa, Ottawa, Ontario, Canada
| | - Ravi V Gottumukkala
- From the Department of Radiology and Diagnostic Imaging (W.T.) and Department of Laboratory Medicine and Pathology (B.A.A.), University of Alberta, 116 St & 85 Ave, Edmonton, AB, Canada T6G 2R3; Department of Radiology, Brigham and Women's Hospital, Harvard University, Boston, Mass (R.V.G., S.G.S.); and Departments of Radiology (N.S.) and Urology (L.L.), University of Ottawa, Ottawa, Ontario, Canada
| | - Nicola Schieda
- From the Department of Radiology and Diagnostic Imaging (W.T.) and Department of Laboratory Medicine and Pathology (B.A.A.), University of Alberta, 116 St & 85 Ave, Edmonton, AB, Canada T6G 2R3; Department of Radiology, Brigham and Women's Hospital, Harvard University, Boston, Mass (R.V.G., S.G.S.); and Departments of Radiology (N.S.) and Urology (L.L.), University of Ottawa, Ottawa, Ontario, Canada
| | - Luke Lavallée
- From the Department of Radiology and Diagnostic Imaging (W.T.) and Department of Laboratory Medicine and Pathology (B.A.A.), University of Alberta, 116 St & 85 Ave, Edmonton, AB, Canada T6G 2R3; Department of Radiology, Brigham and Women's Hospital, Harvard University, Boston, Mass (R.V.G., S.G.S.); and Departments of Radiology (N.S.) and Urology (L.L.), University of Ottawa, Ottawa, Ontario, Canada
| | - Benjamin A Adam
- From the Department of Radiology and Diagnostic Imaging (W.T.) and Department of Laboratory Medicine and Pathology (B.A.A.), University of Alberta, 116 St & 85 Ave, Edmonton, AB, Canada T6G 2R3; Department of Radiology, Brigham and Women's Hospital, Harvard University, Boston, Mass (R.V.G., S.G.S.); and Departments of Radiology (N.S.) and Urology (L.L.), University of Ottawa, Ottawa, Ontario, Canada
| | - Stuart G Silverman
- From the Department of Radiology and Diagnostic Imaging (W.T.) and Department of Laboratory Medicine and Pathology (B.A.A.), University of Alberta, 116 St & 85 Ave, Edmonton, AB, Canada T6G 2R3; Department of Radiology, Brigham and Women's Hospital, Harvard University, Boston, Mass (R.V.G., S.G.S.); and Departments of Radiology (N.S.) and Urology (L.L.), University of Ottawa, Ottawa, Ontario, Canada
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Doi K, Marei AE, Hattori Y, Sakamoto S, Sonezaki S. Diagnostic Accuracy of Magnetic Resonance Imaging With 3-Dimensional T2-SPACE Techniques for Preganglionic Injury of the Brachial Plexus. J Hand Surg Am 2022; 47:953-961. [PMID: 36041945 DOI: 10.1016/j.jhsa.2022.06.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Revised: 05/07/2022] [Accepted: 06/23/2022] [Indexed: 02/02/2023]
Abstract
PURPOSE An accurate diagnosis of the site and severity of a brachial plexus injury is imperative for selecting the appropriate management. Conventional magnetic resonance imaging (MRI) does not allow for the precise interpretation of preganglionic injuries (pre-GIs), especially intravertebral canal injuries. We developed 4 MRI sequences of conventional 1.5-tesla 3-dimensional T2-weighted turbo spin echo sampling perfection with the application of optimized contrasts using different flip angles evolution (T2-SPACE) images to clearly visualize each component of the brachial plexus. The purpose of this study was to introduce basic normal and pathologic findings of our current MRI approach, focusing on its diagnostic accuracy for pre-GIs. METHODS We initially examined 119 patients with brachial plexus injuries who underwent surgical exploration by MRI using 4 sequences of the 1.5-tesla 3-dimensional T2-SPACE technique. We obtained coronal, transverse, coronal oblique, and coronal cuts of T2 short time inversion recovery. The images of 595 roots were interpreted by multiple-image synchronizing techniques of the 4 views to precisely interpret the presence of spinal cord edema, numbers of anterior and posterior rootlets, sites of ganglions, meningeal cysts, and the "black line sign" (displaced ruptured dura or bundles of ruptured rootlets). We assessed the accuracy, sensitivity, and specificity of these abnormal findings with regard to diagnosing pre-GIs by comparing surgical exploration. RESULTS The absence or decreased numbers of anterior and posterior rootlets and displacement of ganglions were definitive evidence of pre-GIs and the other findings, like spinal cord edema, meningeal cysts, and black line signs, were predictive signs. CONCLUSIONS The synchronizing techniques of the four 1.5-tesla 3-dimensional T2-SPACE images provided high diagnostic accuracy of pre-GIs. TYPE OF STUDY/LEVEL OF EVIDENCE Diagnostic II.
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Affiliation(s)
- Kazuteru Doi
- Department of Orthopedic Surgery, Ogori Daiichi General Hospital, Yamaguchi City, Japan.
| | - Abdelhakim Ezzat Marei
- Department of Orthopedic Surgery, Ogori Daiichi General Hospital, Yamaguchi City, Japan; Department of Orthopaedic Surgery and Traumatology, Tanta University, Tanta, Egypt
| | - Yasunori Hattori
- Department of Orthopedic Surgery, Ogori Daiichi General Hospital, Yamaguchi City, Japan
| | - Sotetsu Sakamoto
- Department of Orthopedic Surgery, Ogori Daiichi General Hospital, Yamaguchi City, Japan
| | - Shichoh Sonezaki
- Department of Orthopedic Surgery, Ogori Daiichi General Hospital, Yamaguchi City, Japan
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Wu P, Huang C, Shi B, Jin A. Comparison of region-of-interest delineation methods for diffusion tensor imaging in patients with cervical spondylotic radiculopathy. BMC Musculoskelet Disord 2022; 23:677. [PMID: 35840941 PMCID: PMC9284815 DOI: 10.1186/s12891-022-05639-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Accepted: 07/06/2022] [Indexed: 11/20/2022] Open
Abstract
Background Diffusion tensor imaging is a promising technique for determining the responsible lesion of cervical radiculopathy, but the selection and delineation of the region of interest (ROI) affect the results. This study explored the impact of different ROI sketching methods on the repeatability and consistency of DTI measurement values in patients with cervical spondylotic radiculopathy (CSR). Methods This retrospective study included CSR patients who underwent DTI imaging. The images were analyzed independently by two radiologists. Four delineation methods were used: freehand method, maximum roundness, quadrilateral method, and multi-point averaging method. They re-examined the images 6 weeks later. The intra-class correlation coefficient (ICC) was used to investigate the consistency between the two measurements and the reproducibility between two radiologists. Results Forty-two CSR patients were included in this study. The distribution of the compressed nerve roots was five C4, eight C5, sixteen C6, eleven C7, and two C8. No differences were found among the four methods in fractional anisotropy (FA) or apparent diffusion coefficient (ADC), irrespective of radiologists (all P>0.05). Similar results were observed between the first and second measurements (all P>0.05), but some significant differences were observed for radiologist 2 for the four-small rounds method (P=0.033). The freehand and single largest circle methods were the two methods with the highest ICC between the two measurements and the two radiologists (all ICC >0.90). Conclusion The freehand and single largest circle methods were the most consistent methods for delineating DTI ROI in patients with CSR.
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Affiliation(s)
- Penghuan Wu
- Shaoguan First People's Hospital, Affiliated Shaoguan First People's Hospital, Southern Medical University, Guangdong, China
| | - Chengyan Huang
- Department of Radiology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Benchao Shi
- Department of Spinal Surgery, Orthopedics Center, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Anmin Jin
- Department of Spinal Surgery, Orthopedics Center, Zhujiang Hospital, Southern Medical University, Guangzhou, China.
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Lao Q, Jia Y, Zhao K, Liu K, Feng J. Value of High-Resolution MRI in the Diagnosis of Brachial Plexus Injury in Infants and Young Children. Int J Gen Med 2022; 15:5673-5680. [PMID: 35755861 PMCID: PMC9215839 DOI: 10.2147/ijgm.s362738] [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: 02/21/2022] [Accepted: 06/13/2022] [Indexed: 11/26/2022] Open
Abstract
Purpose To investigate the value of high-resolution MRI based on 3D-short inversion time inversion recovery sampling perfection with application-optimized contrasts (3D-STIR SPACE) sequence for the diagnosis of brachial plexus injury in infants and young children. Methods Physical examination, electromyography (EMG) and MRI data of 26 children with brachial plexus injury were retrospectively analyzed. Sensitivity, specificity, and accuracy were calculated for the three tests. The agreement among these examinations was analyzed with the Kappa test. P<0.05 was considered statistically significant. Results Of the 26 children, 3 cases had normal MRIs, 23 cases had unilateral brachial plexus injury diagnosed with MRI, and a total of 73 nerve roots and/or sheaths were involved. Among the 23 cases with aberrant MRI findings, there were 19 cases of nerve root thickening (42 nerve roots), 4 cases of nerve root sleeve expansion (5 nerve roots), 17 cases of pseudomeningeal cysts (34 nerve roots), 2 cases of nerve root loosening (2 nerve roots), 8 cases of nerve root dissection (11 nerve roots), 19 cases with increased nerve signal (43 nerve roots), and 9 cases with an increased signal of the muscles on the affected side. As for the diagnosis of brachial plexus injury, the sensitivity and the accuracy of physical examination, EMG and MRI were 0.92, 0.86, and 0.88, respectively. The agreement between MRI and physical examination was substantial (κ=0.780, P=0.000), as did the agreement between MRI and EMG (κ=0.611, P=0.005). Conclusion High-resolution MRI based on 3D-STIR SPACE sequence plays a role in the diagnosis and evaluation of brachial plexus injury in infants and young children. It can accurately identify the injured nerve and characterize related pathological alterations. Besides EMG and physical examination, it can be used as a valuable tool for screening and monitoring of brachial plexus injury in infants and children.
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Affiliation(s)
- Qun Lao
- Department of Radiology, Hangzhou Children's Hospital, Hangzhou, People's Republic of China
| | - Yuzhu Jia
- Department of Radiology, Tongde Hospital of Zhejiang Province, Hangzhou, People's Republic of China
| | - Kaiyu Zhao
- Department of Radiology, Hangzhou Children's Hospital, Hangzhou, People's Republic of China
| | - Kun Liu
- Department of Radiology, The Second Affiliated Hospital and Yuying Children's Hospital, Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Jianju Feng
- Department of Radiology, Zhuji Affiliated Hospital of Shaoxing University, Shaoxing, People's Republic of China
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Boulter DJ, Job J, Shah LM, Wessell DE, Lenchik L, Parsons MS, Agarwal V, Appel M, Burns J, Hutchins TA, Kendi AT, Khan MA, Liebeskind DS, Moritani T, Ortiz AO, Shah VN, Singh S, Than KD, Timpone VM, Beaman FD, Corey AS. ACR Appropriateness Criteria® Plexopathy: 2021 Update. J Am Coll Radiol 2021; 18:S423-S441. [PMID: 34794598 DOI: 10.1016/j.jacr.2021.08.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 08/28/2021] [Indexed: 10/19/2022]
Abstract
Plexopathy may be caused by diverse pathologies, including trauma, nerve entrapment, neoplasm, inflammation, infection, autoimmune disease, hereditary disease, and idiopathic etiologies. For patients presenting with brachial or lumbosacral plexopathy, dedicated plexus MRI is the most appropriate initial imaging modality for all clinical scenarios and can identify processes both intrinsic and extrinsic to the nerves. Other imaging tests may be appropriate for initial imaging depending on the clinical scenario. This document addresses initial imaging strategies for brachial and lumbosacral plexopathy in the following clinical situations: nontraumatic plexopathy with no known malignancy, traumatic plexopathy (not perinatal), and plexopathy occurring in the context of a known malignancy or posttreatment syndrome. The American College of Radiology Appropriateness Criteria are evidence-based guidelines for specific clinical conditions that are reviewed annually by a multidisciplinary expert panel. The guideline development and revision include an extensive analysis of current medical literature from peer reviewed journals and the application of well-established methodologies (RAND/UCLA Appropriateness Method and Grading of Recommendations Assessment, Development, and Evaluation or GRADE) to rate the appropriateness of imaging and treatment procedures for specific clinical scenarios. In those instances where evidence is lacking or equivocal, expert opinion may supplement the available evidence to recommend imaging or treatment.
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Affiliation(s)
- Daniel J Boulter
- Clinical Director of MRI, The Ohio State University Wexner Medical Center, Columbus, Ohio.
| | - Joici Job
- Research Author, The Ohio State University Wexner Medical Center, Columbus, Ohio
| | - Lubdha M Shah
- Panel Chair, University of Utah, Salt Lake City, Utah
| | | | - Leon Lenchik
- Panel Vice-Chair, Wake Forest University School of Medicine, Winston Salem, North Carolina
| | - Matthew S Parsons
- Panel Vice-Chair, Mallinckrodt Institute of Radiology, Saint Louis, Missouri
| | - Vikas Agarwal
- Vice Chair of Education, Chief, Neuroradiology, and Director, Spine Intervention, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Marc Appel
- James J. Peters VA Medical Center, Bronx, New York; American Academy of Orthopaedic Surgeons
| | - Judah Burns
- Program Director, Diagnostic Radiology Residency Program, Montefiore Medical Center, Bronx, New York
| | - Troy A Hutchins
- Chief Value Officer for Radiology, University of Utah Health, Salt Lake City, Utah
| | | | - Majid A Khan
- Thomas Jefferson University Hospital, Philadelphia, Pennsylvania
| | - David S Liebeskind
- University of California Los Angeles, Los Angeles, California; President, SVIN; and American Academy of Neurology
| | | | - A Orlando Ortiz
- Chairman, Department of Radiology, Jacobi Medical Center, Bronx, New York
| | - Vinil N Shah
- University of California San Francisco, San Francisco, California; and Executive Committee, American Society of Spine Radiology
| | - Simranjit Singh
- Indiana University School of Medicine, Indianapolis, Indiana; Secretary, SHM, Indiana Chapter; Secretary, SGIM, Midwest Region; and American College of Physicians
| | - Khoi D Than
- Duke University, Durham, North Carolina; Neurosurgery expert
| | - Vincent M Timpone
- Co-Director, Neuroradiology Spine Intervention Service, Department of Radiology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, Colorado
| | | | - Amanda S Corey
- Specialty Chair, Atlanta VA Health Care System and Emory University, Atlanta, Georgia
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Khodarahmi I, Fritz J. The Value of 3 Tesla Field Strength for Musculoskeletal Magnetic Resonance Imaging. Invest Radiol 2021; 56:749-763. [PMID: 34190717 DOI: 10.1097/rli.0000000000000801] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
ABSTRACT Musculoskeletal magnetic resonance imaging (MRI) is a careful negotiation between spatial, temporal, and contrast resolution, which builds the foundation for diagnostic performance and value. Many aspects of musculoskeletal MRI can improve the image quality and increase the acquisition speed; however, 3.0-T field strength has the highest impact within the current diagnostic range. In addition to the favorable attributes of 3.0-T field strength translating into high temporal, spatial, and contrast resolution, many 3.0-T MRI systems yield additional gains through high-performance gradients systems and radiofrequency pulse transmission technology, advanced multichannel receiver technology, and high-end surface coils. Compared with 1.5 T, 3.0-T MRI systems yield approximately 2-fold higher signal-to-noise ratios, enabling 4 times faster data acquisition or double the matrix size. Clinically, 3.0-T field strength translates into markedly higher scan efficiency, better image quality, more accurate visualization of small anatomic structures and abnormalities, and the ability to offer high-end applications, such as quantitative MRI and magnetic resonance neurography. Challenges of 3.0-T MRI include higher magnetic susceptibility, chemical shift, dielectric effects, and higher radiofrequency energy deposition, which can be managed successfully. The higher total cost of ownership of 3.0-T MRI systems can be offset by shorter musculoskeletal MRI examinations, higher-quality examinations, and utilization of advanced MRI techniques, which then can achieve higher gains and value than lower field systems. We provide a practice-focused review of the value of 3.0-T field strength for musculoskeletal MRI, practical solutions to challenges, and illustrations of a wide spectrum of gainful clinical applications.
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Affiliation(s)
- Iman Khodarahmi
- From the Division of Musculoskeletal Radiology, Department of Radiology, NYU Grossman School of Medicine, New York, NY
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Su X, Kong X, Lu Z, Zhou M, Wang J, Liu X, Kong X, Zhang H, Zheng C. Use of Magnetic Resonance Neurography for Evaluating the Distribution and Patterns of Chronic Inflammatory Demyelinating Polyneuropathy. Korean J Radiol 2020; 21:483-493. [PMID: 32193896 PMCID: PMC7082655 DOI: 10.3348/kjr.2019.0739] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2019] [Accepted: 12/19/2019] [Indexed: 02/07/2023] Open
Abstract
Objective To evaluate the distribution and characteristics of peripheral nerve abnormalities in chronic inflammatory demyelinating polyneuropathy (CIDP) using magnetic resonance neurography (MRN) and to examine the diagnostic efficiency. Materials and Methods Thirty-one CIDP patients and 21 controls underwent MR scans. Three-dimensional sampling perfections with application-optimized contrasts using different flip-angle evolutions and T1-/T2- weighted turbo spin-echo sequences were performed for neurography of the brachial and lumbosacral (LS) plexus and cauda equina, respectively. Clinical data and scores of the inflammatory Rasch-built overall disability scale (I-RODS) in CIDP were obtained. Results The bilateral extracranial vagus (n = 11), trigeminal (n = 12), and intercostal nerves (n = 10) were hypertrophic. Plexus hypertrophies were observed in the brachial plexus of 19 patients (61.3%) and in the LS plexus of 25 patients (80.6%). Patterns of hypertrophy included uniform hypertrophy (17 [54.8%] brachial plexuses and 21 [67.7%] LS plexuses), and multifocal fusiform hypertrophy (2 [6.5%] brachial plexuses and 4 [12.9%] LS plexuses) was present. Enlarged and/or contrast-enhanced cauda equina was found in 3 (9.7%) and 13 (41.9%) patients, respectively. Diameters of the brachial and LS nerve roots were significantly larger in CIDP than in controls (p < 0.001). The largest AUC was obtained for the L5 nerve. There were no significant differences in the course duration, I-RODS score, or diameter between patients with and without hypertrophy. Conclusion MRN is useful for the assessment of distribution and characteristics of the peripheral nerves in CIDP. Compared to other regions, LS plexus neurography is more sensitive for CIDP.
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Affiliation(s)
- Xiaoyun Su
- Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Xiangquan Kong
- Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Zuneng Lu
- Department of Neurology, Renming Hospital of Wuhan University, Wuhan, China
| | - Min Zhou
- Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Jing Wang
- Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Xiaoming Liu
- Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Xiangchuang Kong
- Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China
| | - Huiting Zhang
- MR Scientific Marketing, Siemens Healthineers, Shanghai, China
| | - Chuansheng Zheng
- Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China.
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9
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Ha DH. MR Neurography: Current Several Issues for Novice Radiologists. JOURNAL OF THE KOREAN SOCIETY OF RADIOLOGY 2020; 81:81-100. [PMID: 36238129 PMCID: PMC9432089 DOI: 10.3348/jksr.2020.81.1.81] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 12/24/2019] [Accepted: 01/08/2020] [Indexed: 11/15/2022]
Abstract
말초신경병증의 진단을 위해 MR neurography의 사용이 점차 증가하고 있다. 고대조도와 고해상도로 말초신경을 직접 영상화한 MR 영상을 MR neurography라고 하고, 지방억제 T2 강조영상과 확산강조영상이 흔히 사용되는 시퀀스이다. 작은 직경, 복잡한 해부학적 구조를 가진 말초신경을 합리적 시간 안에 영상화하기 위해서 최신의 isotropic 3차원 기법, 다양한 고속영상기법, post-processing 영상 기법 등이 사용된다. 이런 발전들로 인해 MR neurography가 유용하게 사용되지만 항상 적절한 MR neurography 영상을 얻을 수 있는 것은 아니다. 적절한 MR neurography 영상을 얻기 위해 영상의학과 의사가 고려해야 할 다음의 몇가지 쟁점들이 있다. 이에는 적절한 표준 프로토콜의 선책, 지방억제 기법의 선택, 해상도와 field of view와 slice thickness 간의 상호 관계의 이해, 적절한 post-processing 영상 기법의 적용, 2차원 영상획득 기법과 3차원 영상획득 기법의 장단점, 근위부 말초신경과 말단부 말초신경의 T2 대조도의 차이, 말초신경에 인접한 정맥이 MR neurography에 미치는 영향, 확산강조영상에서 기하학적 왜곡의 발생과 적절한 b value의 선택 등이다. 이런 쟁점들을 잘 이해하는 것이 경험이 적은 영상의학과 의사가 적절한 MR neurography 영상을 얻고, 말초신경병증을 정확히 평가하는 데 많은 도움이 될 것이다.
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Affiliation(s)
- Dong-ho Ha
- Department of Radiology, Dong-A University, Busan, Korea
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10
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Multimodal magnetic resonance imaging of peripheral nerves: Establishment and validation of brachial and lumbosacral plexi measurements in 163 healthy subjects. Eur J Radiol 2019; 117:41-48. [PMID: 31307651 DOI: 10.1016/j.ejrad.2019.05.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 05/19/2019] [Accepted: 05/23/2019] [Indexed: 01/06/2023]
Abstract
PURPOSE This study aims to provide normal reference values for quantitative parameters for brachial and lumbosacral plexi on multimodal MRI. In addition, the parameter variations between the left and right sides, the individual nerve groups, genders and age groups were also evaluated. MATERIALS AND METHODS Multimodal MRI was evaluated in 163 healthy subjects, who were randomly divided into three groups: brachial plexus, lumbosacral plexus and diffusion tensor imaging groups. Nerve diameters, contrast ratios, T2 nerve-muscle signal ratios (nT2), fractional anisotropy (FA) values and apparent diffusion coefficients (ADC) were measured in both plexi. Parametric tests and Pearson correlation for normally distributed data, and non-parametric tests and Spearman correlation for non-normally distributed data were used. RESULTS There were no significant differences in parameters between the left and right sides. The diameters of the C7, L4-S1, sciatic, and femoral nerve roots were larger in men than in women (P < 0.05). The nT2 in the brachial and lumbosacral plexi and the contrast ratio in the lumbosacral plexus were significantly higher in the elderly. The diameter of the S1 nerve root was smaller in the elderly. There were no significant differences between the individual nerve groups in contrast ratios and in brachial plexus nT2. A gradual increase in the nT2 from the top to the bottom was observed in the L4-S1 nerve roots (P < 0.05). CONCLUSION This study provides multi-parameter normative data for the brachial and lumbosacral plexi while considering differences between the two sides, the individual nerves, genders, and the ages.
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Magnetic resonance neurography appearance and diagnostic evaluation of peripheral nerve sheath tumors. Sci Rep 2019; 9:6939. [PMID: 31061436 PMCID: PMC6502820 DOI: 10.1038/s41598-019-43450-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 04/24/2019] [Indexed: 02/07/2023] Open
Abstract
Imaging appearances of peripheral nerve sheath tumors by MRI are difficult distinguish from soft-tissue tumors. The objective of this study was to evaluate the feasibility and imaging appearance of high-resolution 3-T magnetic resonance neurography (MRN) of the diagnosis of peripheral nerve sheath tumors (PNSTs) using sampling perfection with application-optimized contrasts using different flip angle evolution (SPACE) sequences. We retrospectively evaluated the MRI and 3D Short tau inversion recovery sampling perfection with application-optimized contrasts using varying flip-angle evolutions (3D-STIR SPACE) sequences of 30 patients with PNSTs diagnosed by surgery and pathology. The contrast-enhanced 3D-STIR SPACE images were retrospectively analyzed and evaluated for the visualization of PNSTs. The tumors were evaluated by their number, location, morphology, size, signal intensity and enhancement characteristics. The imaging findings and characteristic signs of conventional MRI scanning and contrast-enhanced 3D-STIR SPACE sequences were compared. In these cases, conventional MRI images display the location, number, shape, size and signal characteristics of the lesions. These tumors were mostly solitary and had a well-defined boundary. Compared to conventional MRI images, imaging appearances including neurogenic origin, length of the peripheral nerves and relation to the nerve of PNSTs on 3D-STIR SPACE images were more accuracy (P < 0.05). Compared to 3D-STIR SPACE images, contrast-enhanced images can more clearly display background suppression of the peripheral nerves. The “split fat” sign and “target” sign were seen in some patients. 3D STIR SPACE sequences demonstrate its significant capacity to diagnostic evaluate and location of PNSTs. This article comprehensively reviews radiologic findings and illustrates the MRN features of PNSTs. 3D-STIR SPACE sequences be used for preoperative evaluation of PNSTs.
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The Multidisciplinary Approach to the Diagnosis and Management of Nonobstetric Traumatic Brachial Plexus Injuries. AJR Am J Roentgenol 2018; 211:1319-1331. [DOI: 10.2214/ajr.18.19887] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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13
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Klupp E, Cervantes B, Sollmann N, Treibel F, Weidlich D, Baum T, Rummeny EJ, Zimmer C, Kirschke JS, Karampinos DC. Improved Brachial Plexus Visualization Using an Adiabatic iMSDE-Prepared STIR 3D TSE. Clin Neuroradiol 2018; 29:631-638. [DOI: 10.1007/s00062-018-0706-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 07/03/2018] [Indexed: 12/12/2022]
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Somatotopic Fascicular Lesions of the Brachial Plexus Demonstrated by High-Resolution Magnetic Resonance Neurography. Invest Radiol 2018; 52:741-746. [PMID: 28723713 DOI: 10.1097/rli.0000000000000401] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
OBJECTIVES The aim of this study was to evaluate whether high-resolution brachial plexus (BP) magnetic resonance neurography (MRN) is capable of (1) distinguishing patients with compressive neuropathy or noncompressive plexopathy from age- and sex-matched controls, (2) discriminating between patients with compressive neuropathy and noncompressive plexopathy, and (3) detecting spatial lesion patterns suggesting somatotopic organization of the BP. MATERIALS AND METHODS Thirty-six patients (50.9 ± 12.7 years) with clinical symptoms, nerve conduction studies, and needle electromyography findings suggestive of brachial plexopathy and 36 control subjects matched for age and sex (50.8 ± 12.6 years) underwent high-resolution MRN of the BP. Lesion determination and localization was performed by 2 blinded neuroradiologists at the anatomical levels of the plexus trunks and cords. RESULTS By applying defined criteria of structural plexus lesions on high-resolution MRN, all patients were correctly rated as affected, whereas 34 of 36 controls were correctly rated as unaffected by independent and blinded reading from 2 neuroradiologists with overall good to excellent interrater reliability. In all cases, plexopathies with a compressive etiology (n = 12) were correctly distinguished from noncompressive plexopathies with inflammatory origin (n = 24). Pathoanatomical contiguity of lesion from trunk into cord level allowed recognition of distinct somatotopical patterns of fascicular involvement, which correlated closely with the spatial distribution of clinical symptoms and electrophysiological data. CONCLUSIONS Brachial plexus MRN is highly accurate for differentiating patients with symptomatic plexopathy from healthy controls and for distinguishing patients with compressive neuropathy and noncompressive plexopathy. Furthermore, BP MRN revealed evidence for somatotopic organization of the BP. Therefore, as an addition to functional information of electrodiagnostic studies, anatomical information gained by BP MRN may help to improve the efficiency and accuracy of patient care.
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Ahlawat S, Fayad LM. Diffusion weighted imaging demystified: the technique and potential clinical applications for soft tissue imaging. Skeletal Radiol 2018; 47:313-328. [PMID: 29159675 DOI: 10.1007/s00256-017-2822-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 10/26/2017] [Accepted: 11/07/2017] [Indexed: 02/02/2023]
Abstract
Diffusion-weighted imaging (DWI) is a fast, non-contrast technique that is readily available and easy to integrate into an existing imaging protocol. DWI with apparent diffusion coefficient (ADC) mapping offers a quantitative metric for soft tissue evaluation and provides information regarding the cellularity of a region of interest. There are several available methods of performing DWI, and artifacts and pitfalls must be considered when interpreting DWI studies. This review article will review the various techniques of DWI acquisition and utility of qualitative as well as quantitative methods of image interpretation, with emphasis on optimal methods for ADC measurement. The current clinical applications for DWI are primarily related to oncologic evaluation: For the assessment of de novo soft tissue masses, ADC mapping can serve as a useful adjunct technique to routine anatomic sequences for lesion characterization as cyst or solid and, if solid, benign or malignant. For treated soft tissue masses, the role of DWI/ADC mapping in the assessment of treatment response as well as recurrent or residual neoplasm in the setting of operative management is discussed, especially when intravenous contrast medium cannot be given. Emerging DWI applications for non-neoplastic clinical indications are also reviewed.
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Affiliation(s)
- Shivani Ahlawat
- The Russell H. Morgan Department of Radiology & Radiological Science, The Johns Hopkins Medical Institutions, 600 North Wolfe Street, Baltimore, MD, 21287, USA.
| | - Laura M Fayad
- The Russell H. Morgan Department of Radiology & Radiological Science, The Johns Hopkins Medical Institutions, 600 North Wolfe Street, Baltimore, MD, 21287, USA.,Department of Oncology, The Johns Hopkins Medical Institutions, 600 North Wolfe Street, Baltimore, MD, 21287, USA.,Department of Orthopaedic Surgery, The Johns Hopkins Medical Institutions, 600 North Wolfe Street, Baltimore, MD, 21287, USA
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Eguchi Y, Kanamoto H, Oikawa Y, Suzuki M, Yamanaka H, Tamai H, Kobayashi T, Orita S, Yamauchi K, Suzuki M, Inage K, Aoki Y, Watanabe A, Furuya T, Koda M, Takahashi K, Ohtori S. Recent advances in magnetic resonance neuroimaging of lumbar nerve to clinical applications: A review of clinical studies utilizing Diffusion Tensor Imaging and Diffusion-weighted magnetic resonance neurography. Spine Surg Relat Res 2017; 1:61-71. [PMID: 31440614 PMCID: PMC6698557 DOI: 10.22603/ssrr.1.2016-0015] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 12/30/2016] [Indexed: 11/05/2022] Open
Abstract
Much progress has been made in neuroimaging with Magnetic Resonance neurography and Diffusion Tensor Imaging (DTI) owing to higher magnetic fields and improvements in pulse sequence technology. Reports on lumbar nerve DTI have also increased considerably. Many studies have shown that the use of DTI in lumbar nerve lesions, such as lumbar foraminal stenosis and lumbar disc herniation, makes it possible to capture images of interruptions of tractography at stenotic sties, enabling the diagnosis of stenosis. DTI can also reveal significant decreases in fractional anisotropy (FA) with significant increases in apparent diffusion coefficient (ADC) values in compression lesions. FA values have higher accuracy than ADC values. Furthermore, strong correlations exist between FA values and indications of neurological severity, including the Japanese Orthopedic Association (JOA) score, the Oswestry Disability Index (ODI), and the Roland-Morris Disability Questionnaire (RDQ) in patients with lumbar disc herniation-induced radiculopathy. Most lumbar DTI has become 3T; 3T MRI has made it possible to take high-resolution DTI measurements in a short period of time. However, increased motion artifacts in the magnetic susceptibility effect lead to signal irregularities and image distortion. In the future, high-resolution DTI with reduced field-of-view may become useful in clinical applications, since visualization of nerve lesions and quantification of DTI parameters could allow more accurate diagnoses of lumbar nerve dysfunctions. Future translational studies will be necessary to successfully bring MR neuroimaging of lumbar nerve into clinical use.
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Affiliation(s)
- Yawara Eguchi
- Department of Orthopedic Surgery, National Hospital Organization Shimoshizu National Hospital, Japan
| | - Hirohito Kanamoto
- Department of Orthopedic Surgery, Graduate School of Medicine, Chiba University, Japan
| | - Yasuhiro Oikawa
- Division of Orthopaedic Surgery, Chiba Children's Hospital, Japan
| | - Munetaka Suzuki
- Department of Orthopedic Surgery, National Hospital Organization Shimoshizu National Hospital, Japan
| | - Hajime Yamanaka
- Department of Orthopedic Surgery, National Hospital Organization Shimoshizu National Hospital, Japan
| | - Hiroshi Tamai
- Department of Orthopedic Surgery, National Hospital Organization Shimoshizu National Hospital, Japan
| | - Tatsuya Kobayashi
- Department of Orthopedic Surgery, National Hospital Organization Shimoshizu National Hospital, Japan
| | - Sumihisa Orita
- Department of Orthopedic Surgery, Graduate School of Medicine, Chiba University, Japan
| | - Kazuyo Yamauchi
- Department of Orthopedic Surgery, Graduate School of Medicine, Chiba University, Japan
| | - Miyako Suzuki
- Department of Orthopedic Surgery, Graduate School of Medicine, Chiba University, Japan
| | - Kazuhide Inage
- Department of Orthopedic Surgery, Graduate School of Medicine, Chiba University, Japan
| | - Yasuchika Aoki
- Department of Orthopaedic Surgery, Eastern Chiba Medical Center, Japan
| | - Atsuya Watanabe
- Department of Orthopaedic Surgery, Eastern Chiba Medical Center, Japan
| | - Takeo Furuya
- Department of Orthopedic Surgery, Graduate School of Medicine, Chiba University, Japan
| | - Masao Koda
- Department of Orthopedic Surgery, Graduate School of Medicine, Chiba University, Japan
| | - Kazuhisa Takahashi
- Department of Orthopedic Surgery, Graduate School of Medicine, Chiba University, Japan
| | - Seiji Ohtori
- Department of Orthopedic Surgery, Graduate School of Medicine, Chiba University, Japan
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Zhang J, Zhang F, Xiao F, Xiong Z, Liu D, Hua T, Indima N, Tang G. Quantitative Evaluation of the Compressed L5 and S1 Nerve Roots in Unilateral Lumbar Disc Herniation by Using Diffusion Tensor Imaging. Clin Neuroradiol 2017; 28:529-537. [DOI: 10.1007/s00062-017-0621-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2017] [Accepted: 08/03/2017] [Indexed: 02/06/2023]
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Mahbub ZB, Peters AM, Gowland PA. Presence of time-dependent diffusion in the brachial plexus. Magn Reson Med 2017. [PMID: 28626999 DOI: 10.1002/mrm.26733] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
PURPOSE This work describes the development of a method to measure the variation of apparent diffusion coefficient (ADC) with diffusion time (Δ) in the brachial plexus, as a potential method of probing microstructure. METHODS Diffusion-weighted MRI with body signal suppression was used to highlight the nerves from surrounding tissues, and sequence parameters were optimized for sensitivity to change with diffusion time. A porous media-restricted diffusion model based on the Latour-Mitra equation was fitted to the diffusion time-dependent ADC data from the brachial plexus nerves and cord. RESULTS The ADC was observed to reduce at long diffusion times, confirming that diffusion was restricted in the nerves and cord in healthy subjects. T2 of the nerves was measured to be 80 ± 5 ms, the diffusion coefficient was found to vary from (1.5 ± 0.1) × 10-3 mm2 /s at a diffusion time of 18.3 ms to (1.0 ± 0.2) × 10-3 mm2 /s at a diffusion time of 81.3 ms. CONCLUSION A novel method of probing restricted diffusion in the brachial plexus was developed. Resulting parameters were comparable with values obtained previously on biological systems. Magn Reson Med 79:789-795, 2018. © 2017 International Society for Magnetic Resonance in Medicine.
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Affiliation(s)
- Zaid B Mahbub
- Department of Arts & Sciences, Ahsanullah University of Science & Technology, Dhaka, Bangladesh.,Sir Peter Mansfield Imaging Centre, School of Physics & Astronomy, University of Nottingham, United Kingdom
| | - Andrew M Peters
- Sir Peter Mansfield Imaging Centre, School of Physics & Astronomy, University of Nottingham, United Kingdom
| | - Penny A Gowland
- Sir Peter Mansfield Imaging Centre, School of Physics & Astronomy, University of Nottingham, United Kingdom
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Wang X, Harrison C, Mariappan YK, Gopalakrishnan K, Chhabra A, Lenkinski RE, Madhuranthakam AJ. MR Neurography of Brachial Plexus at 3.0 T with Robust Fat and Blood Suppression. Radiology 2017; 283:538-546. [DOI: 10.1148/radiol.2016152842] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Xinzeng Wang
- From the Department of Radiology (X.W., C.E.H., A.C., R.E.L., A.J.M.) and Advanced Imaging Research Center (A.C., R.E.L., A.J.M.), UT Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75019-9061; and Philips Healthcare, Philips Innovation Campus, Bangalore, India (Y.K.M., K.G.)
| | - Crystal Harrison
- From the Department of Radiology (X.W., C.E.H., A.C., R.E.L., A.J.M.) and Advanced Imaging Research Center (A.C., R.E.L., A.J.M.), UT Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75019-9061; and Philips Healthcare, Philips Innovation Campus, Bangalore, India (Y.K.M., K.G.)
| | - Yogesh K. Mariappan
- From the Department of Radiology (X.W., C.E.H., A.C., R.E.L., A.J.M.) and Advanced Imaging Research Center (A.C., R.E.L., A.J.M.), UT Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75019-9061; and Philips Healthcare, Philips Innovation Campus, Bangalore, India (Y.K.M., K.G.)
| | - Karthik Gopalakrishnan
- From the Department of Radiology (X.W., C.E.H., A.C., R.E.L., A.J.M.) and Advanced Imaging Research Center (A.C., R.E.L., A.J.M.), UT Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75019-9061; and Philips Healthcare, Philips Innovation Campus, Bangalore, India (Y.K.M., K.G.)
| | - Avneesh Chhabra
- From the Department of Radiology (X.W., C.E.H., A.C., R.E.L., A.J.M.) and Advanced Imaging Research Center (A.C., R.E.L., A.J.M.), UT Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75019-9061; and Philips Healthcare, Philips Innovation Campus, Bangalore, India (Y.K.M., K.G.)
| | - Robert E. Lenkinski
- From the Department of Radiology (X.W., C.E.H., A.C., R.E.L., A.J.M.) and Advanced Imaging Research Center (A.C., R.E.L., A.J.M.), UT Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75019-9061; and Philips Healthcare, Philips Innovation Campus, Bangalore, India (Y.K.M., K.G.)
| | - Ananth J. Madhuranthakam
- From the Department of Radiology (X.W., C.E.H., A.C., R.E.L., A.J.M.) and Advanced Imaging Research Center (A.C., R.E.L., A.J.M.), UT Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75019-9061; and Philips Healthcare, Philips Innovation Campus, Bangalore, India (Y.K.M., K.G.)
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Yamashita R, Isoda H, Arizono S, Furuta A, Ohno T, Ono A, Murata K, Togashi K. Selective visualization of pelvic splanchnic nerve and pelvic plexus using readout-segmented echo-planar diffusion-weighted magnetic resonance neurography: A preliminary study in healthy male volunteers. Eur J Radiol 2017; 86:52-57. [DOI: 10.1016/j.ejrad.2016.10.034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 10/21/2016] [Accepted: 10/27/2016] [Indexed: 02/02/2023]
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Diagnostic Value and Surgical Implications of the 3D DW-SSFP MRI On the Management of Patients with Brachial Plexus Injuries. Sci Rep 2016; 6:35999. [PMID: 27782162 PMCID: PMC5080541 DOI: 10.1038/srep35999] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 10/07/2016] [Indexed: 01/09/2023] Open
Abstract
Three-dimensional diffusion-weighted steady-state free precession (3D DW-SSFP) of high-resolution magnetic resonance has emerged as a promising method to visualize the peripheral nerves. In this study, the application value of 3D DW-SSFP brachial plexus imaging in the diagnosis of brachial plexus injury (BPI) was investigated. 33 patients with BPI were prospectively examined using 3D DW-SSFP MR neurography (MRN) of brachial plexus. Results of 3D DW-SSFP MRN were compared with intraoperative findings and measurements of electromyogram (EMG) or somatosensory evoked potentials (SEP) for each injured nerve root. 3D DW-SSFP MRN of brachial plexus has enabled good visualization of the small components of the brachial plexus. The postganglionic section of the brachial plexus was clearly visible in 26 patients, while the preganglionic section of the brachial plexus was clearly visible in 22 patients. Pseudomeningoceles were commonly observed in 23 patients. Others finding of MRN of brachial plexus included spinal cord offset (in 16 patients) and spinal cord deformation (in 6 patients). As for the 3D DW-SSFP MRN diagnosis of preganglionic BPI, the sensitivity, the specificity and the accuracy were respectively 96.8%, 90.29%, and 94.18%. 3D DW-SSFP MRN of brachial plexus improve visualization of brachial plexus and benefit to determine the extent of injury.
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Wang L, Niu Y, Kong X, Yu Q, Kong X, Lv Y, Shi H, Li C, Wu W, Wang B, Liu D. The application of paramagnetic contrast-based T2 effect to 3D heavily T2W high-resolution MR imaging of the brachial plexus and its branches. Eur J Radiol 2016; 85:578-84. [DOI: 10.1016/j.ejrad.2015.12.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 11/30/2015] [Accepted: 12/02/2015] [Indexed: 11/17/2022]
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Kumar Y, Wadhwa V, Phillips L, Pezeshk P, Chhabra A. MR imaging of skeletal muscle signal alterations: Systematic approach to evaluation. Eur J Radiol 2016; 85:922-35. [PMID: 27130052 DOI: 10.1016/j.ejrad.2016.02.007] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 02/02/2016] [Accepted: 02/03/2016] [Indexed: 01/24/2023]
Abstract
Muscle edema or edema-like signal alterations are commonly encountered findings in musculoskeletal magnetic resonance (MR) imaging. Although such signal alterations are very sensitive for detection of the underlying muscle pathology, these are often non-specific findings. Encompassing knowledge of their typical clinical presentations, characteristic appearances and patterns of muscle signal alterations and following a systematic approach towards their assessment, a reader can effectively narrow down the differential diagnosis. This article outlines the role of conventional imaging and advanced anatomic and functional musculoskeletal MR imaging techniques in the evaluation of various muscle disorders and presents a systematic approach towards their diagnosis and management.
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Affiliation(s)
- Yogesh Kumar
- Department of Radiology, Yale New Haven Health System at Bridgeport Hospital, CT, United States
| | - Vibhor Wadhwa
- Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, AR, United States
| | - Lauren Phillips
- Department of Neurology and Neurotherapeutics, UT Southwestern Medical Center, Dallas, TX, United States
| | - Parham Pezeshk
- Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - Avneesh Chhabra
- Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX, United States.
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