Prevalence of anatomic variations of the CoW in a group of 50 term-born infants (24 with normal MR imaging findings and 26 with abnormal MR imaging findings)
| Term (normal MRI) | Term (abnormal MRI) | P Value | |
|---|---|---|---|
| Completeness of CoW | 9 in 24 (37.5%) | 11 in 26 (42.3%) | .477 |
| AcomA absence/hypoplasia | 6 in 24 (25%) | 6 in 26 (23.1%) | .567 |
| PcomA absence/hypoplasia | 13 in 48 (27%) | 18 in 52 (34.6%) | .276 |
| A1 segment of ACA absence/hypoplasia | 5 in 48 (10.4%) | 1 in 52 (1.9%) | .053* |
| P1 segment of PCA absence/hypoplasia | 4 in 48 (8.3%) | 3 in 52 (5.7%) | .455 |
| Fetal-type origin of PCA | 14 in 48 (29%) | 12 in 52 (23%) | .321 |
| Transitional-configuration origin of PCA | 6 in 48 (12.5%) | 5 in 52 (9.6%) | .443 |
| Bilateral fetal-type origin | 8 in 14 (57.1%) | 6 in 12 (50%) | .512 |
| Bilaterally absent PcomA | 6 in 13 (46.2%) | 14 in 18 (77.8%) | .076 |
* Statistically significant.