Prevalence of anatomic variations of the CoW in a group of 41 preterm-at-term infants (19 born after 30 weeks' GA, 22 born before 30 weeks' GA) with normal MR imaging findings
| Preterm (>30 weeks) | Preterm (<30 weeks) | P Value | |
|---|---|---|---|
| Completeness of CoW | 7 in 19 (36.8%) | 11 in 22 (50%) | .298 |
| AcomA absence/hypoplasia | 4 in 19 (21%) | 2 in 22 (9%) | .262 |
| PcomA absence/hypoplasia | 15 in 38 (39.5%) | 11 in 44 (25%) | .122 |
| A1 segment of ACA absence/hypoplasia | 0 in 38 (0%) | 1 in 44 (2%) | .537 |
| P1 segment of PCA absence/hypoplasia | 2 in 38 (5.2%) | 2 in 44 (4.5%) | .635 |
| Fetal-type origin of PCA | 12 in 38 (31.6%) | 10 in 44 (22.7%) | .257 |
| Transitional-configuration origin of PCA | 1 in 38 (2.6%) | 3 in 44 (6.8%) | .365 |
| Bilateral fetal-type origin | 10 in 12 (83.3%) | 4 in 10 (40%) | .048* |
| Bilaterally absent PcomA | 10 in 15 (66.7%) | 4 in 11 (36.4%) | .129 |
Note:—GA indicates gestational age.
* Statistically significant.