Pronator Syndrome Due to Schwannoma

Afshar, Ahmadreza

doi:10.1007/s12593-013-0115-1

Cited by 14 publications

(9 citation statements)

References 10 publications

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“…The issue is still clinically important. Although magnetic resonance imaging and ultrasonography have facilitated the diagnosis of median nerve entrapment (Chen et al 2011 ; Asheghan et al 2016 ; Zamborsky et al 2017 ), pronator syndrome may be easily overlooked and mistaken for the much more frequent carpal tunnel syndrome (Lee and LaStayo 2004 ; Bilecenoglu et al 2005 ; Dang and Rodner 2009 ; Afshar 2015 ; Vymazalová et al 2015 ). Pronator syndrome may manifest with pain in the PT region as well as paresthesia and dysthesia or paralysis in the median nerve innervation zone (Lee and LaStayo 2004 ; Bilecenoglu et al 2005 ; Andreisek et al 2006 ; Dang and Rodner 2009 ; Miller and Reinus 2010 ; Vymazalová et al 2015 ).…”

Section: Introductionmentioning

confidence: 99%

“…Pronator teres syndrome is a complex group of neuropathies associated with the compression of the median nerve by the PT muscle or fibrous band extending from the surface of the humeral head of the PT. Compression of the MN in the proximal part of the forearm may be caused by the following anatomical structures: the PT muscle having two heads of origin, the presence of a proximal arch to the flexor digitorum superficialis muscle, lacertus fibrosus in the antecubital fossa or an anomalous Struther ligament (Bilecenoglu et al 2005 ; Camerlinck et al 2010 ; Afshar 2015 ; Vymazalová et al 2015 ). One possible form of compression of the MN in the proximal part of the forearm is caused by variation in the humeral and ulnar heads of the PT (Bilecenoglu et al 2005 ; Andreisek et al 2006 ; Xing and Tang 2014 ; Asheghan et al 2016 ).…”

Section: Introductionmentioning

confidence: 99%

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Anatomical variations of the pronator teres muscle in a Central European population and its clinical significance

et al. 2017

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The pronator teres (PT) muscle is a forearm flexor with radial and ulnar heads. It is innervated by the median nerve (MN), which passes between these heads. Nerve entrapment, known as “PT syndrome”, may occur in this passage. Anatomical variations in this region may be potential risk factors of this pathology. Therefore, the aim of the study was to determine the relationship between morphologic variations of the PT and the MN. In 50 isolated, formalin-fixed upper limbs, the cubital region and the forearm were dissected. The following measurements were taken: origin of the PT muscle heads, the length of these heads, the length of the forearm, diameter of the MN and the number of its muscular branches to the pronator teres muscle. The forearms with the humeral head originating from the medial humeral epicondyle and medial intermuscular septum (72%) were significantly shorter (p = 0.0088) than those where the humeral head originated only from the medial humeral epicondyle. Moreover, in these specimens, the MN was significantly thinner (p = 0.003). The ulnar head was present in 43 limbs (86%). The MN passed between the heads of the PT muscle (74%) or under the muscle (26%). In the majority of cases, it provided two motor branches (66%). There is an association between the morphologic variation of the PT muscle heads and the course and branching pattern of the MN. Both are related to differences in forearm length. This may have an impact on the risk of PT syndrome and the performance of MN electrostimulation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anatomical variations of the pronator teres muscle in a Central European population and its clinical significance

et al. 2017

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“…In determining the aetiology of AINS, magnetic resonance imaging (MRI) might be useful to differentiate between NA and compression and to identify rare tumors in atypical cases [ 58 , 70 , 74 , 75 ]. Fascicular (or hourglass) constrictions of unknown origin, potentially trauma, inflammation, or autoimmune, are a common finding in recent imaging and surgical studies of AINS, suggesting neuritis such as NA.…”

Section: Clinical Presentationmentioning

confidence: 99%

Proximal Median Nerve Compression in the Differential Diagnosis of Carpal Tunnel Syndrome

Löppönen

Hulkkonen

Ryhänen

2022

JCM

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Carpal tunnel syndrome (CTS) is the most common median nerve compression neuropathy. Its symptoms and clinical presentation are well known. However, symptoms at median nerve distribution can also be caused by a proximal problem. Pronator syndrome (PS) and anterior interosseous nerve syndrome (AINS) with their typical characteristics have been thought to explain proximal median nerve problems. Still, the literature on proximal median nerve compressions (PMNCs) is conflicting, making this classic split too simple. This review clarifies that PMNCs should be understood as a spectrum of mild to severe nerve lesions along a branching median nerve, thus causing variable symptoms. Clear objective findings are not always present, and therefore, diagnosis should be based on a more thorough understanding of anatomy and clinical testing. Treatment should be planned according to each patient’s individual situation. To emphasize the complexity of causes and symptoms, PMNC should be named proximal median nerve syndrome.

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“…S3), and dialysis-related disease. 1,8,9 Clinical Presentation The symptoms are insidious in onset and typically associated with strenuous activities. The affected muscles include the flexor pollicis longus, abductor pollicis brevis, flexor digitorum profundus, and opponens pollicis.…”

Section: Anatomy and Etiologymentioning

confidence: 99%

MRI Evaluation of Various Elbow, Forearm, and Wrist Neuropathies: A Pictorial Review

Husain

Reddy

Dayan

et al. 2021

Semin Musculoskelet Radiol

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Upper extremity entrapment neuropathies are common and can cause pain, sensory loss, and muscle weakness leading to functional disability. We conducted a retrospective review from January 2007 until March 2020 of the magnetic resonance imaging (MRI) features of intrinsic and extrinsic causes of wrist, forearm, and elbow neuropathies of 637 patients who received a diagnosis of neuropathy by means of clinical and electrodiagnostic testing. We discuss cases with varying intrinsic and extrinsic nerve pathologies, including postoperative examples, affecting the median, radial, and ulnar nerve.Our collection of cases demonstrates a diversity of intrinsic and extrinsic causative factors. Intrinsic pathologies include neuritis as well as tumors arising from the nerve. Extrinsic causes resulting in nerve entrapment include masses, acute and chronic posttraumatic cases, anatomical variants, inflammatory and crystal deposition, calcium pyrophosphate deposition disease, and dialysis-related amyloidosis. Finally, we review postsurgical cases, such as carpal tunnel release and ulnar nerve transposition.Although upper extremity neuropathies tend to have a typical clinical presentation, imaging, particularly MRI, plays a vital role in evaluating the etiology and severity of each neuropathy and ultimately helps guide clinical management.

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Pronator Syndrome Due to Schwannoma

Cited by 14 publications

References 10 publications

Anatomical variations of the pronator teres muscle in a Central European population and its clinical significance

Anatomical variations of the pronator teres muscle in a Central European population and its clinical significance

Proximal Median Nerve Compression in the Differential Diagnosis of Carpal Tunnel Syndrome

MRI Evaluation of Various Elbow, Forearm, and Wrist Neuropathies: A Pictorial Review

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