Article Figures & Data
Figures
- Fig 1.
Axial images of a patient with confirmed recurrent herniated disk.
A, Axial image obtained before the administration of contrast medium.
B, Axial image obtained 5 minutes after the administration of contrast medium.
C, Axial image obtained 20 minutes after the administration of contrast medium shows the placement of a cursor to measure disk and scar enhancement.
- Fig 2.
Sagittal unenhanced T1-weighted image (A) and axial images (B–G) obtained in one patient. B, C, and D were acquired before (B), 5 minutes (C), and 20 minutes (D) after the IV administration of nonionic contrast material. E, F, and G, were acquired before (E), 5 minutes (F), and 20 minutes (G) after the IV administration of ionic contrast material.
- Fig 3.
Graph shows contrast enhancement of disk and scar from gadopentetate and gadodiamide in patient 3.
- Fig 4.
Graph shows average enhancement of disk and scar with gadopentetate and gadodiamide at 5 and 20 minutes after the administration of contrast medium.
- Fig 5.
Graph shows disk enhancement as a proportion of scar enhancement for gadodiamide and gadopentetate at 5 and 20 minutes after injection.
Tables
Clinical data, operative summary, and signal intensity changes with time after contrast medium injection for patients who received ionic and nonionic contrast medium
Patient No. Age (yr) History Reoperation Findings Contrast Medium Signal Intensity Baseline 5 min 20 min Scar Disk Scar Disk Scar Disk 1 47 Two previous excisions of herniated disk at L4–L5, recurrent left leg pain Not offered Gadopentetate 43.1 48.3 69.9 40.1 93.4 48.4 Gadodiamide 33.9 34.6 87.7 58.0 89.4 47.1 2 43 L3–L4 discectomy, recurrent pain At laminectomy, large scar and fragment containing end plate and bone Gadopentetate 42.7 45.4 88.6 33.5 76.1 44.7 Gadodiamide 28.6 36.6 103.6 47.7 86.0 69.0 3 37 5 years previously, laminectomy and discectomy at L4–L5, pain recurred At laminectomy, large fragment Gadopentetate 22.9 33.1 45.4 33.1 52.8 34.8 Gadodiamide 33.8 24.8 72.9 33.8 90.5 32.8 4 47 Pain in lower back, previous L4–L5 laminectomy and discectomy Lost to follow-up Gadopentetate 68.9 60.0 99.6 61.8 103.5 68.8 Gadodiamide 46.2 40.0 80.3 52.0 78.3 56.0 5 46 Previous discectomies L4–L5 and L5–S1, low back and left lower extremity pain Not offered Gadopentetate 25.9 27.1 47.5 32.2 42.7 30.5 Gadodiamide 23.5 22.8 46.0 25.7 47.0 39.3 6 48 Microdiscectomy L5–S1 1 year previously, recurrence of pain Not offered Gadopentetate 35.0 32.0 59.0 45.0 68.0 54.0 Gadodiamide 35.0 32.0 91.0 54.0 80.0 57.0 7 39 Discectomy L4–L5 in 1998, revision in 2000, gradually worsening right buttock and thigh pain for 6 months Anterior discectomy Gadopentetate 37.9 53.3 94.7 65.7 90.8 72.4 Gadodiamide 33.7 43.7 76.9 49.3 80.5 51.5 8 42 Microdiscectomy L4–L5, acute onset of pain radiating into left leg At laminectomy, large herniation Gadopentetate 24.0 21.0 67.0 28.0 Gadodiamide 18.0 22.0 87.0 40.0
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