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Observer variation in the evaluation of lumbar herniated discs and root compression: spiral CT compared with MRI.
J C van Rijn1, N Klemetso, J B Reitsma
1Department of Clinical Epidemiology and Biostatistics, Academic Medical Center, AZ, Amsterdam.
The British Journal of Radiology
|April 25, 2006
Summary
Spiral CT and MRI show similar results for detecting herniated discs. However, MRI is more reliable for evaluating nerve root compression in patients with lumbosacral radicular syndrome.
Area of Science:
- Radiology
- Medical Imaging
- Neurosurgery
Background:
- Spiral computed tomography (CT) is a potential alternative to magnetic resonance imaging (MRI) for diagnosing herniated discs.
- Accurate diagnosis is crucial for managing lumbosacral radicular syndrome.
Purpose of the Study:
- To compare the radiological evaluation of spiral CT with MRI in patients suspected of herniated discs.
- To assess the reliability of each imaging modality for detecting disc herniation and nerve root compression.
Main Methods:
- 57 patients with lumbosacral radicular syndrome underwent both spiral CT and 1.5 T MRI.
- Two independent neuroradiologists evaluated intervertebral discs for herniation/bulge and nerve roots for compression.
- Interobserver agreement was compared using the kappa statistic.
Main Results:
- No significant difference in interobserver agreement was found for detecting herniated or bulging discs between CT and MRI (kappa 0.66 vs 0.71).
- MRI showed significantly better interobserver agreement for evaluating nerve root compression compared to CT (kappa 0.78 vs 0.59).
- Disagreements between CT and MRI occurred in 18% of discs and 12% of nerve roots.
Conclusions:
- Spiral CT is not inferior to MRI for the radiological evaluation of lumbar herniated discs.
- MRI is a more reliable tool than spiral CT for evaluating lumbar nerve root compression.
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