Sciatic neuropathy: findings on magnetic resonance neurography

Agnollitto, Paulo Moraes; Chu, Marcio Wen King; Simão, Marcelo Novelino; Nogueira-Barbosa, Marcello Henrique

doi:10.1590/0100-3984.2015.0205

Cited by 13 publications

(9 citation statements)

References 21 publications

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“…In less than one third of patients, these imaging modalities were helpful in confirming the diagnosis of a sciatic neuropathy, but these imaging modalities failed to shed further light on the etiology. Our observations are in agreement with the previous finding of some utility of imaging studies in selected patients being evaluated for sciatic neuropathy . Further large‐scale studies are needed.…”

Section: Discussionsupporting

confidence: 92%

Clinical and Electrodiagnostic Features Of Nontraumatic Sciatic Neuropathy

Cherian

2018

Muscle and Nerve

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Introduction: In this study we sought to characterize etiologies and features of sciatic neuropathy unrelated to penetrating nerve trauma. Methods: This investigation was a retrospective review of 109 patients with electrodiagnostically confirmed sciatic neuropathies. Results: Hip replacement surgery represented the most common (34.9%) etiology, whereas inflammatory sciatic neuropathy was seen in 7.3%. Electrodiagnostic testing revealed an axonal neuropathy in 95.4% and a demyelinating neuropathy in 4.6%. Predominant involvement of the peroneal division was seen in 39.4% and was tibial in 5.5%. Nine of 31 (29.0%) patients who had MRI or neuromuscular ultrasound study showed abnormalities within the sciatic nerve. At the final visit, 46.4% of patients required assistance for ambulation. Young age, lack of severe initial weakness, and presence of tibial compound muscle action potential or sural sensory nerve action potential were predictors of favorable outcome. Discussion: Sciatic neuropathies are usually axonal on electrodiagnostic testing, affect preferentially the peroneal division, and are commonly associated with incomplete recovery.Muscle Nerve 59:309-314, 2019Additional supporting information may be found in the online version of this article.

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Section: Discussionsupporting

confidence: 92%

Clinical and Electrodiagnostic Features Of Nontraumatic Sciatic Neuropathy

Cherian

2018

Muscle and Nerve

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“…The accuracy of MR neurography is greater than that of conventional MRI ( p < 0.05) [12]. MR neurography is ideal for use in 3.0-T MRI with a protocol following graded fluid signal-sensitive sequences with fat suppression [17]. Identification of peripheral nerve disorders with MR neurography can be seen from changes in signal intensity, especially on T2-weighted images, followed by changes in nerve morphology, as well as disorganization or absence of a characteristic fascicular pattern.…”

Section: Discussionmentioning

confidence: 99%

“…Identification of peripheral nerve disorders with MR neurography can be seen from changes in signal intensity, especially on T2-weighted images, followed by changes in nerve morphology, as well as disorganization or absence of a characteristic fascicular pattern. 3D STIR-SPACE with contrast can clearly show important information about the origin of a tumor in the nerve, the extent of its involvement, and its relationship to the adjacent nerves [11, 17]. Conventional MRI combined with MR neurography can clearly show the morphological information and the origin of the tumor [11, 17].…”

Section: Discussionmentioning

confidence: 99%

Long Completely Cystic Sciatic Schwannoma: A Rare Case

et al. 2021

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Schwannomas are the most common peripheral nerve sheath tumors. Benign schwannomas with malignant transformation are rarely reported. Most common schwannomas occur in the head and neck region. Sciatic schwannomas are rare, as are completely cystic schwannomas. Sciatic nerve schwannomas represent less than 1% of all schwannomas. Benign tumors in the sciatic nerve consist of 60% neurofibromas and 38% schwannomas. In general, a schwannoma induces chronic symptoms. It can be misleading, sometimes mimicking degenerative spinal pathology due to disc herniation. Schwannoma involving the sciatic nerve can be asymptomatic or may present with sciatica or neurological deficits. Most schwannomas are solid or heterogeneous tumors, and completely cystic schwannomas are rare. The differential diagnoses of nondiscogenic sciatica include lumbar disc herniation, tumor, abscess, hematoma, facet syndrome, lumbar instability, sacroiliitis, piriformis syndrome, and sciatic neuritis. We report a rare case of a long completely cystic sciatic schwannoma in the left foraminal L5–S1 zone extending to the left ischial groove with chronic sciatica that was diagnosed radiologically with a combination of conventional MRI and MR neurography and confirmed histopathologically by surgical resection. The patient previously had conservative therapy, but the complaints were not reduced. Nonsurgical therapy is considered the first choice, and surgical therapy is indicated in cases that do not respond to conservative therapy, with recurrent cysts, severe pain, or neurological deficits.

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“…Subtle changes in nerve contour, size, or signal intensity are better depicted with these neurographic sequences. 31 Lumbar spine origin of the sciatic pain should be ruled out by at least one examination. 28,29 Adductor Tendons, Pubic Symphysis…”

Section: Deep Subgluteal Syndromementioning

confidence: 99%

Conventional and Arthrographic Magnetic Resonance Techniques for Hip Evaluation: What the Radiologist Should Know

Schmaranzer

Cerezal

Llopis

2019

Semin Musculoskelet Radiol

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Over the last 2 decades, the definition of pathomechanical concepts that link osseous deformities to chondrolabral damage and expose young and active patients to the risk of early osteoarthritis has led to a tremendous increase in the number of joint-preserving surgeries performed. The rise in arthroscopic procedures has led to an increasing demand for comprehensive preoperative magnetic resonance imaging (MRI) assessment of the hip joint. This includes conventional MRI for the assessment of extra-articular and periarticular pathologies such as greater trochanteric pain, deep gluteal pain syndrome, and sports injuries. Magnetic resonance arthrography with or without traction is reserved for the accurate evaluation of deformities associated with impingement and hip instability and for detecting the resulting intra-articular lesions. This article summarizes the current standard imaging techniques that the radiologist should know. It also explores the potential of computer-assisted analysis of three-dimensional MRI for virtual impingement simulation and volumetric analysis of cartilage composition and geometry.

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Sciatic neuropathy: findings on magnetic resonance neurography

Cited by 13 publications

References 21 publications

Clinical and Electrodiagnostic Features Of Nontraumatic Sciatic Neuropathy

Clinical and Electrodiagnostic Features Of Nontraumatic Sciatic Neuropathy

Long Completely Cystic Sciatic Schwannoma: A Rare Case

Conventional and Arthrographic Magnetic Resonance Techniques for Hip Evaluation: What the Radiologist Should Know

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