Magnetic resonance imaging findings of redundant nerve roots of the cauda equina

Table 4 The relationships between the disc herniation type at the stenosis levels causing redundant nerve roots, the relative length of redundant nerve roots, and the cross-sectional area of the dural sac of redundant nerve roots of the cauda equina

	Type of disc herniation		P value
	Soft margin (n = 29), mean ± SD	Sharp margin (n = 26), mean ± SD
Relative length of RNRs	3.3 ± 1.42	3.5 ± 1.2	0.562
CSA of RNRs of the cauda equina (mm2)	39.62 ± 12.02	42.54 ± 13.62	0.401

RNRs: Redundant nerve roots; CSA: Cross-sectional area of dural sac; SD: Standard deviation.