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.