| Complication | No of patients | No reoperated | No of procedures |
| Subdural haematoma* | 13 | 7 | 14 |
| Subdural hygroma | 8 | 2 | 3 |
| Subdural empyema | 1 | 1 | 1 |
| Epidural haematoma† | 1 | 1 | 1 |
| IV cranial nerve palsy‡ | 3 | 1† | 1† |
| Anosmia | 1 |
*External hydrocephalus in one patient.
†This patient had a IV cranial nerve palsy and an epidural haematoma.
‡Temporary in two, permanent in one.