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| Preoperative Diagnosis | Percentage of Total Craniotomies (%) | Percentage Requiring Reoperation for Hematoma Evacuation (%) |
| Tumor | 38.82 | 0.99 |
| Functional | 14.12 | 0.23 |
| Hydrocephalus | 13.93 | 0.23 |
| Other | 12.64 | 1.53 |
| Subdural hematoma | 9.52 | 9.12 |
| Vascular | 8.94 | 2.88 |
| Intraparenchymal hematoma | 2.03 | 7.94 |
