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Ionic versus nonionic paramagnetic contrast media in differentiating between scar and herniated disk

C M Nguyen1, K C Ho, H An

  • 1Department of Radiology, Medical College of Wisconsin, Milwaukee, USA.

AJNR. American Journal of Neuroradiology
|March 1, 1996
PubMed
Summary
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Ionic contrast media provide better MR imaging contrast for recurrent herniated disk fragments compared to nonionic media. Timing of the scan also impacts contrast between disk fragments and scar tissue.

Area of Science:

  • Radiology
  • Medical Imaging
  • Spinal Diagnostics

Background:

  • Recurrent herniated disks can be challenging to differentiate from epidural scar tissue on MRI.
  • Paramagnetic contrast media are crucial for enhancing visualization of spinal pathologies.

Purpose of the Study:

  • To compare MR contrast enhancement of ionic versus nonionic paramagnetic contrast media.
  • To differentiate between herniated disk fragments and epidural scar tissue.

Main Methods:

  • A canine model of recurrent herniated disk was established.
  • MR imaging was performed using ionic or nonionic contrast media at 88-90 days post-laminectomy.
  • Contrast enhancement was measured in disk fragments and scar tissue at 2, 22, and 45 minutes post-injection.

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Main Results:

  • Contrast enhancement was significantly higher in scar tissue than in disk fragments.
  • Enhancement difference decreased over time (2-45 minutes).
  • Ionic contrast media showed less enhancement in disk fragments but greater contrast between disk and scar compared to nonionic media.

Conclusions:

  • Scan timing and contrast agent choice significantly affect the differentiation of recurrent disk fragments from scar tissue.
  • Immediate post-injection scans offer better contrast.
  • Ionic contrast media are more effective for visualizing recurrent herniated disk fragments.