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SD: standard deviation
| Operative Characteristics | ||
| Parameter | Number(s) | Percentage(s) |
| Anesthesia | ||
| General | 181 | 68% |
| Spinal | 84 | 32% |
| Complete resection | ||
| Yes | 92 | 35% |
| No | 30 | 11% |
| Not mentioned | 143 | 54% |
| Biopsies | 265 | 100% |
| Tumor container | ||
| Yes | 265 | 100% |
| Deep biopsy container | ||
| Yes | 226 | 85% |
| No | 39 | 15% |
| Additional biopsies | ||
| Yes | 36 | 14% |
| No | 229 | 86% |
| Operative time (mean +/- SD) | 50.1 | +/- 26.6 |
| Type of resection | ||
| Conventional | 197 | 74% |
| En-bloc | 35 | 13% |
| Not mentioned | 33 | 13% |
