CSA of pre- and postoperative magnetic resonance imaging.
| CSA, cm2 | Conventional (n = 24) | BESS (n = 22) | Total (N = 46) | P |
| Preoperative dura sac | 0.75 ± 0.37 | 0.69 ± 0.33 | 0.72 ± 0.35 | 0.644 |
| Postoperative dura sac | 0.97 ± 0.44 | 1.09 ± 0.50 | 1.03 ± 0.47 | 0.412 |
| ΔCSA of dura sac | 0.22 ± 0.47 | 0.40 ± 0.48 | 0.31 ± 0.48 | 0.253 |
| Hematoma | 0.17 ± 0.15 | 0.36 ± 0.34 | 0.26 ± 0.28 | 0.033 |
Abbreviations: BESS, biportal endoscopic spine surgery; CSA, cross-sectional area.
Note: All values presented as mean ± SD.