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Imaging of peripheral nerve lesions
Martin Koltzenburg1, Martin Bendszus
1Institute of Child Health, University College London, London, UK. m.koltzenburg@ich.ucl.ac.uk
Current Opinion in Neurology
|September 16, 2004
Summary
Magnetic resonance imaging (MRI) enhances peripheral nerve disease diagnosis by visualizing nerve damage and muscle changes. This painless, operator-independent method precisely locates lesions, complementing electrophysiological studies.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Peripheral nerve lesions are typically assessed using nerve conduction studies and electromyography.
- Imaging is crucial for identifying mass lesions, compression, and muscle atrophy.
- Magnetic resonance imaging (MRI) is increasingly recognized for its ability to detect peripheral nerve and muscle alterations.
Purpose of the Study:
- To review the role of MRI in the differential diagnosis of peripheral nerve disease.
- To highlight how MRI can identify nerve and muscle changes not evident with conventional methods.
Main Methods:
- Review of recent findings on MRI in peripheral nerve investigations.
- Analysis of T2-weighted imaging, superparamagnetic iron oxide particles, and gadolinium enhancement in denervated muscle.
Main Results:
- Acute axonal nerve lesions show hyperintensity on T2-weighted MRI, indicating Wallerian degeneration and edema.
- Superparamagnetic iron oxide particles can detect macrophage invasion in degenerating nerves.
- MRI findings in denervated muscle correlate with electromyography results, suggesting capillary changes.
Conclusions:
- MRI significantly supplements the diagnosis of peripheral nerve disease, offering a painless, operator-independent alternative.
- MRI precisely identifies axonal damage and lesion sites, overcoming limitations of electrophysiological studies.
- Novel contrast agents may reveal pathophysiological mechanisms like macrophage infiltration, enhancing diagnostic capabilities.