MRi of the operated lumbar spine and enhancement of intradural nerve roots. 478 cases
Cosnard, G.; Boulland, P.; Sarrazin, J.L.; Soulié, D.; Cordoliani, Y.S.
Journal de Radiologie 76(2-3): 111-113
1995
ISSN/ISBN: 0221-0363 PMID: 7714861 Document Number: 450696
Authors report a study of 478 MR imaging in failed back surgery syndrome. Enhancing nerve roots were detected in 73.8%, with a significant higher percentage in male patients, and long postoperative delay. There was no significant correlation with age, enhancement of epidural scar (epidural scar was seen in 75.7%) and disk herniation (seen in 25.9%). Alteration of blood-nerve-barrier causes enhancement, but the mecanism is nuclear: mechanical, biological, immunological or Wallerian degeneration. Diagnostic and prognostic value of enhancement are not proven and a study of asymptomatic patients is necessary.