Imaging findings
| Findings | No. of Patients |
|---|---|
| Position/No. of root nerves involved | |
| Unilateral, single root | 113 |
| Bilateral, single root | 78 |
| Bilateral, ≥2 roots | 22 |
| Nerve root localization | |
| L4 | 1 |
| L5 | 1 |
| S1 | 16 |
| S2 | 142 |
| S3 | 120 |
| S4–S5 | 9 |
| Aspirated cyst size, cm | |
| 1–2 | 1 |
| 2–3 | 111 |
| 3–4 | 32 |
| >4 | 8 |