Distribution of neuroimaging
| Preoperative | Postoperative | |
| Patients with ultrasound (81) | 68 normal 1 non-significant abnormality 0 abnormal | 6 normal 11 non-significant abnormality 10 abnormal |
| Patients with MRI (57) | 7 normal 0 non-significant abnormality 0 abnormal | 36 normal 5 non-significant abnormality 16 abnormal |