| Types of malformations | Number of cases | % | |
| Arnold Chiari II + Spina bifida | 9 | 25 | |
| Dandy Walker | 9 | 25 | |
| Cephalocele | 5 | 14 | |
| Spina bifida | 3 | 8 | |
| Aneurysm of the vein of Galen | 3 | 8 | |
| Agenesis of the corpus callosum | 3 | 8 | |
| Arnold Chiari I + Spina bifida | 2 | 6 | |
| Spina bifida + Low attached spinal cord | 1 | 3 | |
| Arnold Chiari II + Spina bifida + MAB* (MAB) | 1 | 3 | |
| Total | 36 | 100 | |