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Improved Turnaround Times | Median time to first decision: 12 days

Research ArticleSpine Imaging and Spine Image-Guided Interventions

Dynamic Changes in the Dural Sac Cross-Sectional Area on Axial Loaded MR Imaging: Is There a Difference between Degenerative Spondylolisthesis and Spinal Stenosis?

H. Ozawa, H. Kanno, Y. Koizumi, N. Morozumi, T. Aizawa, T. Kusakabe, Y. Ishii and E. Itoi
American Journal of Neuroradiology February 2012, DOI: https://doi.org/10.3174/ajnr.A2920
H. Ozawa
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H. Kanno
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Y. Koizumi
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N. Morozumi
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T. Aizawa
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T. Kusakabe
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Y. Ishii
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E. Itoi
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Abstract

BACKGROUND AND PURPOSE: Axial loaded MR imaging, which can simulate the spinal canal of patients in a standing position, demonstrates a significant reduction of the DCSA compared with conventional MR imaging and provides valuable imaging findings in the assessment of the lumbar spinal canal. The purpose of this study was to compare the DCSA on axial loaded MR imaging between patients with DS and SpS.

MATERIALS AND METHODS: Eighty-eight consecutive patients were divided into DS and SpS groups. DCSA on conventional MR imaging and axial loaded MR imaging and changes in the DCSA induced by axial loading were compared between DS and SpS groups. The prevalence of a significant change (>15 mm2) in the DCSA was compared between the 2 groups.

RESULTS: Axial loaded MR imaging demonstrated significantly smaller DCSA in the DS group (35 ± 22 mm2) than in the SpS group (50 ± 31 mm2), though conventional MR imaging did not show any differences between the 2 groups. The change in the DCSA induced by axial loading was significantly larger in the DS group (17 ± 12 mm2) compared with the SpS group (8 ± 8 mm2). The prevalence of a >15-mm2 change in the DCSA was significantly higher in the DS group (62.5%) than in the SpS group (16.7%) (odds ratio, 8.33; 95% confidence interval, 3.09–22.50).

CONCLUSIONS: Axial loaded MR imaging demonstrated significantly larger changes in the DCSA in patients with DS compared those with SpS. A significant change in the DCSA was more frequently observed in patients with DS. Axial loaded MR imaging may therefore be a more useful tool to decrease the risk of underestimating the spinal canal narrowing in patients with DS than in those with SpS.

Abbreviations

DCSA
dural sac cross-sectional area
DS
degenerative spondylolisthesis
SpS
spinal stenosis
  • © 2012 American Society of Neuroradiology
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Dynamic Changes in the Dural Sac Cross-Sectional Area on Axial Loaded MR Imaging: Is There a Difference between Degenerative Spondylolisthesis and Spinal Stenosis?
H. Ozawa, H. Kanno, Y. Koizumi, N. Morozumi, T. Aizawa, T. Kusakabe, Y. Ishii, E. Itoi
American Journal of Neuroradiology Feb 2012, DOI: 10.3174/ajnr.A2920
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H. Ozawa, H. Kanno, Y. Koizumi, N. Morozumi, T. Aizawa, T. Kusakabe, Y. Ishii, E. Itoi
Dynamic Changes in the Dural Sac Cross-Sectional Area on Axial Loaded MR Imaging: Is There a Difference between Degenerative Spondylolisthesis and Spinal Stenosis?
American Journal of Neuroradiology Feb 2012, DOI: 10.3174/ajnr.A2920

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