| Etiology | No of patients (%) |
| Malformation - Dandy-Walker (DW) - Myelomeningocele (MM) - Primary aqueductal stenosis (PAS) | 36 (47.3%) 18 (23.6%) 12 (15.6%) 06 (7.8%) |
| Tumor - Posterior fossa tumor - Craniopharyngioma - Pineal tumor - Third ventricle tumor | 11 (15.7%) 6 (7.8%) 1 (13%) 2 (2.6%) 3 (3.9%) |
| Post-infectious | 16 (21%) |
| Post-hemorrhage | 1 (1.3%) |
| Unknown | 11 (14.4%) |
| Total | 76 |