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MRI classification of lumbar herniated intervertebral disc
1Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan, Medical College, Seoul, Korea.
Abstract:
A consecutive series of 28 patients with lumbar herniated intervertebral disc (HIVD) who exhibited positive magnetic resonance imaging (MRI) findings was analyzed and compared with operative findings to define the type of disc herniation. This prospective study showed that the overall accuracy of MRI in predicting the types of HIVD was 80.6%. Proton density image was the most helpful in differentiating protruded discs from extruded ones. Disruption of "posterior longitudinal ligament line," defined on T2-weighted sagittal image, was reliable in differentiating a transligamentous disc from subligamentous one. Sequestered disc could be more accurately diagnosed with Gadolinium-DTPA enhancement, which showed anterior rim enhancement of the sequestered portion on T1-weighted axial image.
Insights
Magnetic resonance imaging (MRI) accurately predicts lumbar herniated intervertebral disc (HIVD) types in 80.6% of cases. Specific MRI techniques enhance diagnostic precision for protruded, extruded, and sequestered disc herniations.
Area of Science:
- Neurosurgery
- Radiology
- Orthopedics
Background:
- Lumbar herniated intervertebral disc (HIVD) is a common cause of low back pain.
- Accurate classification of HIVD type is crucial for surgical planning.
- Magnetic resonance imaging (MRI) is a primary diagnostic tool for HIVD.
Purpose of the Study:
- To evaluate the accuracy of MRI in classifying HIVD types.
- To identify specific MRI sequences and findings predictive of different herniation types.
Main Methods:
- Prospective analysis of 28 HIVD patients with positive MRI findings.
- Comparison of MRI findings with intraoperative surgical observations.
- Utilized proton density, T2-weighted sagittal, and Gadolinium-DTPA enhanced T1-weighted axial images.
Main Results:
- Overall MRI accuracy for predicting HIVD type was 80.6%.
- Proton density images effectively distinguished protruded from extruded discs.
- T2-weighted sagittal images identified transligamentous vs. subligamentous herniations via posterior longitudinal ligament line disruption.
- Gadolinium-DTPA enhancement improved diagnosis of sequestered discs.
Conclusions:
- MRI is a valuable tool for classifying lumbar disc herniations.
- Specific MRI sequences offer distinct advantages for differentiating herniation subtypes.
- Enhanced MRI protocols improve diagnostic confidence in complex HIVD cases.