Diffusion-weighted MRI of denervated muscle: a clinical and experimental study.

Abstract:

OBJECTIVE:The aim of this study was to investigate skeletal muscle denervation using diffusion-weighted magnetic resonance imaging (DWMRI). MATERIALS AND METHODS:Sciatic nerve axotomy was performed in a group of nine New Zealand White rabbits, and electromyographic (EMG), pathological, and DWMRI studies were conducted on ipsilateral hamstring muscles 1 and 8 days after axotomy. In addition, DWMRI studies were carried out on leg muscles of ten patients with acute and subacute lumbosacral radiculopathy. RESULTS:High intensity signals on short tau inversion recovery (STIR) magnetic resonance imaging and an increased apparent diffusion coefficient (ADC) were observed in denervated muscles of the animals 1 and 8 days after axotomy as well as in denervated muscles of the patients with radiculopathy. In the clinical study, ADC was 1.26 +/- 0.18 x 10(-9) m(2)/s in normal muscle and increased to 1.56 +/- 0.23 x 10(-9) m(2)/s in denervated muscles (p = 0.0016). In animals, EMG and muscle pathological studies were normal 1 day after axotomy, and the muscles demonstrated spontaneous activity on EMG and neurogenic atrophy on histological studies 7 days later. CONCLUSION:This DWMRI study demonstrates that enlargement of extracellular fluid space in muscle denervation is an early phenomenon occurring several days before the appearance of EMG and histological abnormalities.

journal_name

Skeletal Radiol

journal_title

Skeletal radiology

authors

Holl N,Echaniz-Laguna A,Bierry G,Mohr M,Loeffler JP,Moser T,Dietemann JL,Kremer S

doi

10.1007/s00256-008-0552-2

subject

Has Abstract

pub_date

2008-12-01 00:00:00

pages

1111-7

issue

12

eissn

0364-2348

issn

1432-2161

journal_volume

37

pub_type

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