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Sequential MR imaging of denervated muscle: experimental study.
Martin Bendszus1, Martin Koltzenburg, Carsten Wessig
1Department of Neuroradiology, University of Würzburg, Germany.
AJNR. American Journal of Neuroradiology
|September 12, 2002
Summary
Magnetic resonance (MR) imaging detects early signal intensity changes in denervated muscles within 24-48 hours, preceding atrophy. The TIRM sequence is more sensitive than T2-weighted imaging for diagnosing peripheral nerve damage.
Area of Science:
- Neurology
- Radiology
- Musculoskeletal Imaging
Background:
- Peripheral nerve damage leads to denervated muscle changes detectable by MR imaging.
- Previous studies indicate MR changes occur within days to weeks post-nerve injury.
Purpose of the Study:
- To investigate longitudinal MR imaging changes in denervated muscles.
- To compare the sensitivity of different MR sequences in detecting these changes.
Main Methods:
- Sciatic nerve transection in 12 Lewis rats.
- Longitudinal MR imaging (T1-weighted, T2-weighted, TIRM) at multiple time points post-transection.
- Analysis of muscle signal intensities, T2 relaxation times (T2 TR), and muscle atrophy.
Main Results:
- Early signal intensity increases in denervated muscles (soleus, peroneal) observed within 24-48 hours post-transection on TIRM and T2-weighted images.
- Muscle atrophy detected as early as 7 days post-denervation.
- TIRM sequence demonstrated higher sensitivity to early signal intensity changes compared to T2-weighted imaging.
Conclusions:
- MR imaging, particularly with the TIRM sequence, can detect early signal intensity changes in denervated muscles.
- These MR changes precede observable muscle atrophy.
- MR imaging shows promise for diagnosing peripheral nerve lesions by identifying early denervation-induced muscle alterations.