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MR neurography

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https://www.readbyqxmd.com/read/29694987/-improved-diagnostics-and-therapeutic-decision-making-in-traumatic-peripheral-nerve-lesions-using-mr-neurography
#1
Konstantin D Bergmeister, Philipp Schönle, Arne Hendrik Böcker, Moritz Kronlage, Tim Godel, Simeon Daeschler, Martin Bendszus, Ulrich Kneser, Leila Harhaus, Daniel Schwarz
INTRODUCTION: The correct diagnosis of peripheral nerve injuries is essential for choosing the correct treatment in nerve surgery. Especially, nerve defects require early diagnosis to provide quick surgical reconstruction and prevent long-term disabilities. Recent developments in MR-neurography provide surgeons with a diagnostic tool delivering precise information on the structure and possibly function of nerves. Here we describe a series of cases, that benefited from preoperative MR-neurography to identify the correct type of injury...
April 25, 2018: Handchirurgie, Mikrochirurgie, Plastische Chirurgie
https://www.readbyqxmd.com/read/29662907/demystifying-mr-neurography-of-the-lumbosacral-plexus-from-protocols-to-pathologies
#2
REVIEW
Francisco J Muniz Neto, Eduardo N Kihara Filho, Frederico C Miranda, Laercio A Rosemberg, Durval C B Santos, Atul K Taneja
Magnetic resonance neurography is a high-resolution imaging technique that allows evaluating different neurological pathologies in correlation to clinical and the electrophysiological data. The aim of this article is to present a review on the anatomy of the lumbosacral plexus nerves, along with imaging protocols, interpretation pitfalls, and most common pathologies that should be recognized by the radiologist: traumatic, iatrogenic, entrapment, tumoral, infectious, and inflammatory conditions. An extensive series of clinical and imaging cases is presented to illustrate key-points throughout the article...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29469988/dorsal-root-ganglia-volume-differentiates-schwannomatosis-and-neurofibromatosis-2
#3
Tim Godel, Victor-Felix Mautner, Said Farschtschi, Mirko Pham, Daniel Schwarz, Moritz Kronlage, Isabel Gugel, Sabine Heiland, Martin Bendszus, Philipp Bäumer
Schwannomatosis and neurofibromatosis type 2 are hereditary tumor syndromes, and peripheral neuropathy has been reported in both. We prospectively applied in vivo morphometric measurement of dorsal root ganglia volume in 16 schwannomatosis patients, 14 neurofibromatosis type 2 patients, and 26 healthy controls by magnetic resonance neurography. Compared to healthy controls, dorsal root ganglia hypertrophy was a consistent finding in neurofibromatosis type 2 (L3, + 267%; L4, + 235%; L5, + 241%; S1, + 300%; S2, + 242%; Bonferroni-adjusted p < 0...
April 2018: Annals of Neurology
https://www.readbyqxmd.com/read/29318427/mr-neurography-in-traumatic-non-obstetric-paediatric-brachial-plexopathy
#4
Vaishali Upadhyaya, Divya Narain Upadhyaya, Brijesh Mishra
OBJECTIVES: Many studies have elaborated on the role of magnetic resonance neurography (MRN) in evaluating traumatic brachial plexopathies. Most of these deal with MR findings in adult traumatic plexopathies or children with obstetric brachial plexus palsy (OBPP). Hence, the authors felt the need for this particular study, which focuses on MRN findings in children with non-obstetric traumatic brachial plexus palsy, to find out the distribution and severity of injuries in these patients...
January 9, 2018: European Radiology
https://www.readbyqxmd.com/read/29190522/ultrasound-and-mri-of-nerves-for-monitoring-disease-activity-and-treatment-effects-in-chronic-dysimmune-neuropathies-current-concepts-and-future-directions
#5
REVIEW
Bernhard F Décard, Mirko Pham, Alexander Grimm
New imaging modalities like high-resolution-ultrasound (HRUS) and MR-Neurography (MRN) are increasingly used for the evaluation of the peripheral nervous system. The increasing knowledge on morphological changes observed in different neuropathies has led to a better understanding of underlying pathophysiological processes. The diagnosis of acquired chronic dysimmune neuropathies (CDN) like chronic inflammatory demyelinating polyneuropathy (CIDP), Lewis-Sumner Syndrome (LSS) or multifocal motor neuropathy (MMN) can be challenging...
January 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29146720/role-of-mr-neurography-for-the-diagnosis-of-peripheral-trigeminal-nerve-injuries-in-patients-with-prior-molar-tooth-extraction
#6
R Dessouky, Y Xi, J Zuniga, A Chhabra
BACKGROUND AND PURPOSE: Clinical neurosensory testing is an imperfect reference standard to evaluate molar tooth extraction related peripheral trigeminal neuropathy. The purpose was to evaluate the diagnostic accuracy of MR neurography in this domain and correlation with neurosensory testing and surgery. MATERIALS AND METHODS: In this retrospective study, nerve caliber, T2 signal intensity ratio, and contrast-to-noise ratios were recorded by 2 observers using MR neurography for bilateral branches of the peripheral trigeminal nerve, the inferior alveolar and lingual nerves...
January 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29122764/mr-imaging-of-the-superior-cervical-ganglion-and-inferior-ganglion-of-the-vagus-nerve-structures-that-can-mimic-pathologic-retropharyngeal-lymph-nodes
#7
H Yokota, H Mukai, S Hattori, K Yamada, Y Anzai, T Uno
BACKGROUND AND PURPOSE: The superior cervical ganglion and inferior ganglion of the vagus nerve can mimic pathologic retropharyngeal lymph nodes. We studied the cross-sectional anatomy of the superior cervical ganglion and inferior ganglion of the vagus nerve to evaluate how they can be differentiated from the retropharyngeal lymph nodes. MATERIALS AND METHODS: This retrospective study consists of 2 parts. Cohort 1 concerned the signal intensity of routine neck MR imaging with 2D sequences, apparent diffusion coefficient, and contrast enhancement of the superior cervical ganglion compared with lymph nodes with or without metastasis in 30 patients...
January 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29104742/mr-neurography-in-intraosseous-median-nerve-entrapment
#8
Ankita Aggarwal, Manisha Jana, Vijay Kumar, Deep Narayan Srivastava, Kanwaljeet Garg
Intraosseous entrapment of the median nerve is an uncommon complication of elbow dislocation and fractures. The condition is seen to occur in adolescent age group with a remote history of trauma. We report two rare cases of type 2 intraosseous median nerve entrapment. Though the diagnosis of median neuropathy is made with clinical tests and neurophysiological studies, however exact site of entrapment and presurgical mapping of nerve is done accurately with MR neurography. Imaging thus plays a pivotal role in management of this condition...
October 28, 2017: World Journal of Radiology
https://www.readbyqxmd.com/read/29097415/gadolinium-dtpa-enhancement-characteristics-of-the-rat-sciatic-nerve-after-crush-injury-at-4-7t
#9
B J Hill, K R Padgett, V Kalra, A Marcillo, B Bowen, P Pattany, D Dietrich, R Quencer
BACKGROUND AND PURPOSE: Traumatic peripheral nerve injury is common and results in loss of function and/or neuropathic pain. MR neurography is a well-established technique for evaluating peripheral nerve anatomy and pathology. However, the Gd-DTPA enhancement characteristics of acutely injured peripheral nerves have not been fully examined. This study was performed to determine whether acutely crushed rat sciatic nerves demonstrate Gd-DTPA enhancement and, if so, to evaluate whether enhancement is affected by crush severity...
January 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29043378/-neurogenic-myopathies-and-imaging-of-muscle-denervation
#10
REVIEW
M Wolf, C Wolf, M-A Weber
CLINICAL ISSUE: Neurogenic myopathies are primary diseases of the nervous system, which secondarily result in denervation of the target musculature. The spectrum of potential causes is manifold ranging from acute traumatic injuries and chronic compression to neurodegenerative, inflammatory, metabolic and neoplastic processes. STANDARD DIAGNOSTIC METHODS: The medical history, clinical neurological examination, and electrophysiological tests including electromyography and nerve conduction studies are crucial in diagnosing neuropathic myopathies...
December 2017: Der Radiologe
https://www.readbyqxmd.com/read/29038142/teaching-neuro-images-mr-neurography-for-the-diagnosis-of-hypertrophic-neuropathies
#11
Paulo Victor Sgobbi de Souza, Thiago Bortholin, Fernando George Monteiro Naylor, Wladimir Bocca Vieira de Rezende Pinto, Acary Souza Bulle Oliveira
No abstract text is available yet for this article.
October 17, 2017: Neurology
https://www.readbyqxmd.com/read/29028758/mr-neurography-of-lumbosacral-plexus-in-failed-back-surgery-syndrome
#12
Riham Dessouky, Mohammed Khaleel, Dalia N Khalifa, Hazim I Tantawy, Avneesh Chhabra
STUDY DESIGN: Retrospective clinical case series. OBJECTIVE: To study the role of MRN of lumbosacral plexus in management of patients with FBSS. SUMMARY OF BACKGROUND DATA: Failed back surgery syndrome (FBSS) is one of the major problems in health care, affecting up to 40% of patients following spine surgery. To date, no imaging modality has been used to effectively classify nerve compression, since nerve injuries are challenging to detect on conventional lumbar spine MRI...
October 12, 2017: Spine
https://www.readbyqxmd.com/read/28987674/accuracy-of-mr-neurography-in-the-diagnosis-of-brachial-plexopathy
#13
Julia Crim, Kevin Ingalls
OBJECTIVE: To assess the accuracy of MR neurography (MRN) for the diagnosis for brachial plexopathy. MATERIALS AND METHODS: Forty-three 43 consecutive cases or MRN with electrodiagnostic study correlation were reviewed independently by 2 readers. Established diagnostic criteria were employed: increased signal intensity, enlargement, loss of fascicular pattern, perineural edema and enhancement after administration of gadolinium contrast. An additional 37 cases without electrodiagnostic correlation were included in a second portion of the study, which evaluated interobserver variability...
October 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28932698/quantitative-magnetic-resonance-mr-neurography-for-evaluation-of-peripheral-nerves-and-plexus-injuries
#14
REVIEW
Teodoro Martín Noguerol, Rafael Barousse, Mariano Socolovsky, Antonio Luna
Traumatic conditions of peripheral nerves and plexus have been classically evaluated by morphological imaging techniques and electrophysiological tests. New magnetic resonance imaging (MRI) studies based on 3D fat-suppressed techniques are providing high accuracy for peripheral nerve injury evaluation from a qualitative point of view. However, these techniques do not provide quantitative information. Diffusion weighted imaging (DWI) and diffusion tensor imaging (DTI) are functional MRI techniques that are able to evaluate and quantify the movement of water molecules within different biological structures...
August 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28882864/mr-neurography-of-greater-occipital-nerve-neuropathy-initial-experience-in-patients-with-migraine
#15
L Hwang, R Dessouky, Y Xi, B Amirlak, A Chhabra
BACKGROUND AND PURPOSE: MR imaging of peripheral nerves (MR neurography) allows improved assessment of nerve anatomy and pathology. The objective of this study was to evaluate patients with unilateral occipital neuralgia using MR neurography and to assess the differences in greater occipital nerve signal and size between the symptomatic and asymptomatic sides. MATERIALS AND METHODS: In this case-control evaluation using MR neurography, bilateral greater occipital nerve caliber, signal intensity, signal-to-noise ratios, and contrast-to-noise ratios were determined by 2 observers...
November 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28842238/comparison-of-different-sequences-of-magnetic-resonance-imaging-and-ultrasonography-with-nerve-conduction-studies-in-peripheral-neuropathies
#16
COMPARATIVE STUDY
Ankita Aggarwal, Deep Narayan Srivastava, Manisha Jana, Raju Sharma, Shivanand Gamanagatti, Atin Kumar, Vijay Kumar, Rajesh Malhotra, Vinay Goyal, Kanwaljeet Garg
BACKGROUND: Peripheral neuropathies refer to a group of disorders in which there is damage to the nerves of the peripheral nervous system. Electrophysiologic studies are the main stay for the diagnosis of peripheral neuropathies. However, direct visualization of the nerves is possible with exact localization of site of disease with high-resolution ultrasonography (USG) and 3-Tesla magnetic resonance imaging (MRI) scanner, and newer magnetic resonance (MR) sequences. METHODS: We performed a cross-sectional study including 55 patients and 64 nerves with upper limb peripheral neuropathies...
December 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28830192/sciatic-neuromuscular-variants-on-mr-neurography-frequency-study-and-interobserver-performance
#17
Jason Eastlack, Lulu Tenorio, Vibhor Wadhwa, Kelly Scott, Adam Starr, Avneesh Chhabra
OBJECTIVE: To evaluate the frequency of sciatic neuromuscular variants on MR neurography and determine the interobserver variability. METHODS: A retrospective evaluation of 137 consecutive lumbosacral plexus magnetic resonance neurography examinations was performed. All examinations were performed using nerve selective 3D imaging and independently reviewed by two readers for the presence of sciatic neuromuscular variants and piriformis muscle asymmetry. Inter- and intraobserver performance were evaluated...
November 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28795588/feasibility-of-peripheral-nerve-mr-neurography-using-diffusion-tensor-imaging-adapted-to-skeletal-muscle-disease
#18
Sarah Keller, Zhiyue J Wang, Amir Golsari, Anne Catherine Kim, Hendrik Kooijman, Gerhard Adam, Jin Yamamura
Background Diffusion tensor imaging (DTI) of peripheral nerves may provide additional information about nerve involvement in muscular disorders, but is considered difficult due to different optimal scan parameters tailored to magnetic resonance (MR) signal properties of muscle and neural tissues. Purpose To assess the feasibility of sciatic nerve DTI using two different approaches of region of interest (ROI)-localization in DTI scans with b-values 500 s/mm(2), in participants with muscular disorders and in controls...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28770311/mr-neurography-mrn-of-the-long-thoracic-nerve-retrospective-review-of-clinical-findings-and-imaging-results-at-our-institution-over-4-years
#19
Swati Deshmukh, Laura M Fayad, Shivani Ahlawat
OBJECTIVE: Long thoracic nerve (LTN) injury can result in ipsilateral serratus anterior palsy and scapular winging. Traditional means of evaluating patients with suspected LTN injury include physical examination and electrodiagnostic studies. The purpose of our study is to describe high-resolution magnetic resonance (MR) findings in patients with clinical suspicion of LTN neuropathy. METHODS: In this HIPAA-compliant, IRB-approved, retrospective study, two radiologists reviewed MR imaging performed for long thoracic neuropathy...
November 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28710579/magnetic-resonance-neurography-current-perspectives-and-literature-review
#20
REVIEW
Avneesh Chhabra, Ananth J Madhuranthakam, Gustav Andreisek
Magnetic resonance neurography (also called MRN or MR neurography) refers to MR imaging dedicated to the peripheral nerves. It is a technique that enhances selective multiplanar visualisation of the peripheral nerve and pathology by encompassing a combination of two-dimensional, three-dimensional and diffusion imaging pulse sequences. Referring physicians who seek imaging techniques that can depict and diagnose peripheral nerve pathologies superior to conventional MR imaging are driving the demand for MRN. This article reviews the pathophysiology of peripheral nerves in common practice scenarios, technical considerations of MRN, current indications of MRN, normal and abnormal neuromuscular appearances, and imaging pitfalls...
February 2018: European Radiology
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