Special morphological features of cerebellar disruptive development
| Cerebellar Hemispheres | Vermis | Fourth Ventricle | |
|---|---|---|---|
| Type 1 | Marked volume reduction, immediately beneath the tentorium | Small, shape preserved | Normal width (8) widened (4) |
| Type 2 | Volume reduction, position more lateral | Very small, shape lost | Balloon shaped |
| Type 3 | Marked volume reduction, “Skeletonized,” shape preserved | “Skeletonized,” shape preserved | Normal width |