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MR neurography

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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
#1
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...
November 16, 2017: 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
#2
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...
November 9, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29104742/mr-neurography-in-intraosseous-median-nerve-entrapment
#3
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
#4
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...
November 2, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29043378/-neurogenic-myopathies-and-imaging-of-muscle-denervation
#5
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...
October 17, 2017: Der Radiologe
https://www.readbyqxmd.com/read/29038142/teaching-neuroimages-mr-neurography-for-the-diagnosis-of-hypertrophic-neuropathies
#6
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
#7
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
#8
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
#9
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
#10
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...
September 7, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28842238/comparison-of-different-sequences-of-mri-and-ultrasongram-with-nerve-conduction-studies-in-peripheral-neuropathies
#11
Kanwaljeet Garg, Ankita Aggarwal, Deep Narayan Srivastava, Manisha Jana, Raju Sharma, Shivanand Gamanagatti, Atin Kumar, Vijay Kumar, Rajesh Malhotra, Vinay Goyal, Kanwaljeet Garg
INTRODUCTION: Peripheral neuropathies refer to a group of disorders in which there is damage to the nerves of the peripheral nervous system. Electrophysiological 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 pathology with high resolution ultrasonogram and 3 Tesla MRI scanner, and newer MR sequences. METHODS: We did a cross sectional study including a total of 55 patients and 64 nerves with upper limb peripheral neuropathies...
August 22, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28830192/sciatic-neuromuscular-variants-on-mr-neurography-frequency-study-and-interobserver-performance
#12
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
#13
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%C3%A2-years
#14
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
#15
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...
July 14, 2017: European Radiology
https://www.readbyqxmd.com/read/28696850/advanced-mr-imaging-techniques-for-differentiation-of-neuropathic-arthropathy-and-osteomyelitis-in-the-diabetic-foot
#16
Teodoro Martín Noguerol, Antonio Luna Alcalá, Luis S Beltrán, Marta Gómez Cabrera, Jordi Broncano Cabrero, Joan C Vilanova
Diagnosis and treatment of foot disease in patients with diabetes is a common clinical-radiologic challenge, particularly the differentiation of neuropathic arthropathy from osteomyelitis. Conventional clinical tests and imaging techniques have limited accuracy for evaluation of the diabetic foot. The introduction of morphologic magnetic resonance (MR) imaging in these patients has provided a qualitative leap in diagnosis. The characteristics of soft-tissue and bone marrow edema and their patterns of distribution throughout the foot allow discrimination between both entities...
July 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28679600/sural-nerve-injury-in-familial-amyloid-polyneuropathy-mr-neurography-vs-clinicopathologic-tools
#17
COMPARATIVE STUDY
Jennifer Kollmer, Felix Sahm, Ute Hegenbart, Jan C Purrucker, Christoph Kimmich, Stefan O Schönland, Ernst Hund, Sabine Heiland, John M Hayes, Arnt V Kristen, Christoph Röcken, Mirko Pham, Martin Bendszus, Markus Weiler
OBJECTIVE: To detect and quantify lesions of the small-caliber sural nerve (SN) in symptomatic and asymptomatic transthyretin familial amyloid polyneuropathy (TTR-FAP) by high-resolution magnetic resonance neurography (MRN) in correlation with electrophysiologic and histopathologic findings. METHODS: Twenty-five patients with TTR-FAP, 10 asymptomatic carriers of the mutated transthyretin gene (mutTTR), and 35 age- and sex-matched healthy controls were prospectively included in this cross-sectional case-control study...
August 1, 2017: Neurology
https://www.readbyqxmd.com/read/28620719/large-coverage-mr-neurography-in-cidp-diagnostic-accuracy-and-electrophysiological-correlation
#18
Moritz Kronlage, Philipp Bäumer, Kalliopi Pitarokoili, Daniel Schwarz, Véronique Schwehr, Tim Godel, Sabine Heiland, Ralf Gold, Martin Bendszus, Min-Suk Yoon
The objective of this study was to evaluate large coverage magnetic resonance neurography (MRN) in chronic inflammatory demyelinating polyneuropathy (CIDP). In this prospective study, 18 patients with CIDP and 18 healthy controls were examined by a standardized MRN protocol at 3 T. Lumbosacral plexus was imaged by a T2-weighted 3D sequence and peripheral nerves of the upper and lower extremity by axial T2-weighted turbo spin-echo sequences. Lesions were characterized by nerve cross-sectional area (CSA) and T2-weighted signal (nT2)...
July 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28570096/advanced-mri-techniques-for-the-ankle
#19
REVIEW
Palanan Siriwanarangsun, Won C Bae, Sheronda Statum, Christine B Chung
OBJECTIVE: The purposes of this article are to present a state-of-the-art routine protocol for MRI of the ankle, to provide problem-solving tools based on specific clinical indications, and to introduce principles for the implementation of ultrashort echo time MRI of the ankle, including morphologic and quantitative assessment. CONCLUSION: Ankle injury is common among both athletes and the general population, and MRI is the established noninvasive means of evaluation...
September 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28567306/mr-micro-neurography-and-a-segmentation-protocol-applied-to-diabetic-neuropathy
#20
P F Felisaz, G Maugeri, V Busi, R Vitale, F Balducci, S Gitto, P Leporati, A Pichiecchio, M Baldi, F Calliada, L Chiovato, S Bastianello
The aim of this study was to assess with MRI morphometric ultrastructural changes in nerves affected by diabetic peripheral neuropathy (DPN). We used an MR micro-neurography imaging protocol and a semiautomated technique of tissue segmentation to visualize and measure the volume of internal nerve components, such as the epineurium and nerve fascicles. The tibial nerves of 16 patients affected by DPN and of 15 healthy volunteers were imaged. Nerves volume (NV), fascicles volume (FV), fascicles to nerve ratio (FNR), and nerves cross-sectional areas (CSA) were obtained...
2017: Radiology Research and Practice
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