We found ring enhancement in 10 patients with lumbar disc herniation examined with magnetic resonance. In 5 cases histological examination showed peri-discal granulation tissue. The peripheral enhancement found in some cases of disc herniation is caused by inflammatory granulation tissue.
ArakiYOotaniM: Pseudoenhancement of intervertebral disc herniation. Neuroradiology34: 271–272, 1992.
2.
GallucciMBozzaoA: Does postcontrast MR enhancement in lumbar disk herniation have prognostic value?J Comput Assist Tomogr19: 34–38, 1995.
3.
SnowRDWilliamsJP: Enhancing transdural lumbar disk herniation. Clinical Imaging19: 12–16, 1995.
4.
WasserstromRMamouriamAC: Intradural lumbar disk fragment with ring enhancement on MR. Am J Neuroradiol14: 401–404, 1993.
5.
YasumaTAraiK: The histology of lumbar intervertebral disc herniation. The significance of small blood vassels in the extruded tissue. Spine18: 1761–1765, 1993.
