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Figure 1: (a) Sagittal T2-WI shows hour glass appearance of lumbar spine due to spinal canal stenosis which is severe at L4/5 level. The tortuous nerve roots above the level of compression are depicted with arrows. (b) Axial section above the level of stenosis showing tortuous nerve roots. (c) Axial section at L4/5 level showing ventral disc bulge, hypertrophied facets, trefoil shape of thecal sac, decreased ratio of cerebrospinal fluid to nerve roots and the absence of nerve root sedimentation sign

Figure 1: (a) Sagittal T2-WI shows hour glass appearance of lumbar spine due to spinal canal stenosis which is severe at L4/5 level. The tortuous nerve roots above the level of compression are depicted with arrows. (b) Axial section above the level of stenosis showing tortuous nerve roots. (c) Axial section at L4/5 level showing ventral disc bulge, hypertrophied facets, trefoil shape of thecal sac, decreased ratio of cerebrospinal fluid to nerve roots and the absence of nerve root sedimentation sign