Change in imaging variables from baseline fetal to school age in pre- and postnatal surgery groups
| Imaging Variable | Prenatal Surgery | Postnatal Surgery | P Value |
|---|---|---|---|
| Fourth ventricle size | n = 66 | n = 63 | |
| Changed from small to normal | 36 (55) | 9 (14) | <.001 |
| Remained small | 28 (42) | 51 (81) | |
| Another pattern | 2 (3) | 3 (5) | |
| Tectal beaking | n = 60 | n = 54 | |
| Resolved | 12 (20) | 2 (4) | .008 |
| Not resolved | 48 (80) | 52 (96) | |
| Hindbrain herniation | n = 66 | n = 62 | |
| Resolved | 26 (39) | 8 (13) | .001 |
| Remained the same | 40 (61) | 54 (87) | |
| Cerebellar herniation | n = 65 | n = 62 | |
| Resolved | 32 (49) | 8 (13) | <.001 |
| Remained the same | 32 (49) | 53 (85) | |
| New | 1 (2) | 1 (2) | |
| Cerebellar hypoplasia | n = 61 | n = 54 | |
| Resolved | 44 (72) | 33 (61) | .27 |
| Remained the same | 17 (28) | 20 (37) | |
| New | 0 | 1 (2) | |
| Brainstem kinking | n = 38 | n = 41 | |
| Resolved | 16 (42) | 8 (20) | .02 |
| Remained the same | 20 (53) | 23 (56) | |
| New | 2 (5) | 10 (24) | |
| Structural abnormality (gyral and heterotopia) | n = 64 | n = 60 | |
| Resolved | 2 (3) | 1 (2) | .94 |
| Remained the same | 40 (63) | 40 (67) | |
| New | 22 (34) | 19 (32) |