The Significance of High Signal Intensity on MRI of Lumbar Disc Herniation.

概要

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In order to explore the significance of high signal intensity on MRI of lumbar disc herniation, comparision was made between high and low signal groups of herniation in terms of clinical data, operative and histopathological findings. In 5 of 16 cases, MRI (T2-weighted) demonstrated high signal herniation and 4 of these 5 cases were accompanied by the rupture of the posterior longitudinal ligament (PLL). In 11 cases with low signal intensity, 10 were not accompanied by the rupture of the PLL. There was no significant difference in clinical and histopathological findings between both groups, except for the duration of symptoms and the incidence of vascular infiltration.These findings suggest that high signal intensity on MRI of lumbar disc herniation may be related to the rupture of the PLL followed by the release of herniation from high pressure and increase of water contents.