Patient : Discussion: An L3-L4 diffuse posterior disc bulge prevents contrast from filling the thecal sac at the level of the L3-L4 interspace. However, there is reconstitution of the thecal sac at the mid L4 level. At L4-L5 posterior disc bulge impinges on the thecal sac, predominantly on the left aspect. Impression: 1.Compressive, diffuse disc bulge at L3-L4 prevents contrast from filling the thecal sac at this level. 2.Diffuse disc bulge at L4-L5 impinges on the thecal sac, predominantly compressing the left cauda equina roots.
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