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TABLE 1: Variations of dural sac shape as seen on axial CT or MR images of the lumbar spine in 26 patients with epidural lipomatosis
Lumbar Level Normal Shape Polygonal (hexagonal, pentagonal, or square) Shape Triangular or Y Shape
L3 20 80 0
L4 4 92 4
L5 23 19 58
Note.—Data are percentages.