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Computed tomography of herniated and extruded nucleus pulposus
Journal of Computer Assisted Tomography
|October 1, 1982
Summary
Computed tomography (CT) accurately diagnoses herniated nucleus pulposus (HNP), especially at L5-S1. This noninvasive imaging can bypass myelography when clinical findings correlate, improving patient treatment confidence.
Area of Science:
- Radiology
- Neurosurgery
- Orthopedics
Background:
- Back pain and radiculopathy are common conditions often caused by herniated nucleus pulposus (HNP).
- Accurate diagnosis of HNP is crucial for effective treatment planning.
Purpose of the Study:
- To compare the diagnostic accuracy of computed tomography (CT) and myelography in identifying HNP.
- To evaluate the relationship between HNP size and extrusion incidence.
Main Methods:
- Retrospective analysis of 188 patients undergoing 244 disk space explorations for back pain and radiculopathy.
- Comparison of CT and myelography accuracy in predicting HNP, with specific focus on the L5-S1 level.
- Classification of surgically confirmed HNPs by location, calcification, size, and extrusion.
Main Results:
- CT demonstrated 92% accuracy in diagnosing HNP, compared to 88% for myelography.
- CT accuracy at L5-S1 was 92%, significantly higher than myelography's 70% (p < 0.01).
- HNP size relative to the dural sac diameter strongly predicted extrusion ( < 10% for < half diameter, > 90% for ≥ half diameter; p < 0.001).
Conclusions:
- CT is a highly accurate, noninvasive method for diagnosing HNP, particularly at the L5-S1 level.
- CT provides direct anatomical detail and can potentially replace myelography when clinical correlation exists.
- HNP size is a significant predictor of extrusion, guiding surgical planning and patient management.
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