Surgical outcome in the propensity-matched WHO grade I group
| Outcome | Preoperative tumor embolization | Univariate | |
| Yes=42 n (%) | No=42 n (%) | P value | |
| Intraoperative estimated blood loss, mean±SD (mL) | 178±203 | 221±165 | 0.009 |
| Operation time, mean±SD (hours) | 5.6±2.0 | 6.8±2.8 | 0.036 |
| Simpson grade | 0.185 | ||
| I | 7 (16.7) | 9 (21.4) | |
| II | 21 (50.0) | 17 (40.5) | |
| III | 0 | 4 (9.5) | |
| IV | 14 (33.3) | 12 (28.6) | 0.637 |
| Complications | |||
| Embolization | |||
| Neurological deficits | 0 | 0 | |
| Cerebral infarction | 2 (4.8) | 0 | |
| Cerebral hemorrhage | 1 (2.4) | 0 | |
| Total | 3 (7.1) | 0 | |
| Surgery | |||
| Neurological deficits (transient) | 3 (7.1) | 1 (2.4) | |
| Neurological deficits (permanent) | 2 (4.8) | 1 (2.4) | |
| Cerebral infarction | 0 | 1 (2.4) | |
| Cerebral hemorrhage | 1 (2.4) | 2 (4.8) | |
| Total | 6 (14.3) | 5 (11.9) | 0.746 |
| Combined total complications | 9 (21.4) | 5 (11.9) | 0.241 |
| Postoperative recurrence | 5 (11.9) | 9 (21.4) | 0.241 |
| mRS at last follow-up | 0.268 | ||
| 0 | 25 (59.5) | 19 (45.2) | |
| 1 | 12 (28.6) | 11 (26.2) | |
| 2 | 4 (9.2) | 8 (19.1) | |
| 3 | 0 | 3 (7.1) | |
| 4 | 1 (2.4) | 1 (2.4) | |
| 5 | 0 | 0 | |
| 6 | 0 | 0 | |
| mRS 0–2 at last follow-up | 41 (97.6) | 38 (90.5) | 0.167 |
| Mean follow-up period (months) | 49.1±25.5 | 44.7±36.5 | 0.108 |
mRS, modified Rankin Scale.