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Eur Radiol. 2015 Mar;25(3):644-51. doi: 10.1007/s00330-014-3436-y. Epub 2014 Sep 26.

Muscle MRI STIR signal intensity and atrophy are correlated to focal lower limb neuropathy severity.

Author information

1
Service de Physiologie Clinique-Explorations Fonctionnelles, AP-HP, Hôpital Lariboisière, 2 rue Ambroise Paré, 75010, Paris, France.

Abstract

OBJECTIVES:

The objective is to determine if muscle MRI is useful for assessing neuropathy severity.

METHODS:

Clinical, MRI and electromyography (EMG) examinations were performed in 17 patients with focal lower limb neuropathies. MRI Short Tau Inversion Recovery (STIR) signal intensity, amyotrophy, and muscle fatty infiltration measured after T1-weighted image acquisition, EMG spontaneous activity (SA), and maximal voluntary contraction (MVC) were graded using semiquantitative scores and quantitative scores for STIR signal intensity and were correlated to the Medical Research Council (MRC) score for testing muscle strength. Within this population, subgroups were selected according to severity (mild versus severe), duration (subacute versus chronic), and topography (distal versus proximal) of the neuropathy.

RESULTS:

EMG SA and MVC MRI amyotrophy and quantitative scoring of muscle STIR intensity were correlated with the MRC score. Moreover, MRI amyotrophy was significantly increased in severe, chronic, and proximal neuropathies along with fatty infiltration in chronic lesions.

CONCLUSIONS:

Muscle MRI atrophy and quantitative evaluation of signal intensity were correlated to MRC score in our study. Semiquantitative evaluation of muscle STIR signal was sensitive enough for detection of topography of the nerve lesion but was not suitable to assess severity. Muscle MRI could support EMG in chronic and proximal neuropathy, which showed poor sensitivity in these patients.

PMID:
25257857
DOI:
10.1007/s00330-014-3436-y
[Indexed for MEDLINE]

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