| Complications | 1 month | 3 months |
| CSF leak | 4 (5%) | 0 |
| Subarachnoid hemorrhage | 2 (3%) | 0 |
| Closed stoma | 2 (3%) | 11 (15%) |
| Epilepsy | 0 | 5 (6%) |
| Mortality | 8 (11%) | 18 (24%) |