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Table 2: Reference values of the prevalence of anatomic variations of the CoW in a group of 65 infants (24 term-born, 41 preterm-at-term) with normal MR imaging findings
Term (normal MRI) n = 24 Preterm (normal MRI) n = 41 P Value Mean
Completeness of CoW 9 in 24 (37.5%) 18 in 41 (44%) .405 41.50%
AcomA absence/hypoplasia 6 in 24 (25%) 6 in 41 (14.6%) .237 18.50%
PcomA absence/hypoplasia 13 in 48 (27%) 26 in 82 (31.7%) .363 30%
A1 segment of ACA absence/hypoplasia 5 in 48 (10.4%) 1 in 82 (1.2%) .026^* 4.60%
P1 segment of PCA absence/hypoplasia 4 in 48 (8.3%) 4 in 82 (4.8%) .332 6.10%
Fetal-type origin of PCA 14 in 48 (29%) 22 in 82 (26.8%) .463 27.70%
Transitional-configuration origin of PCA 6 in 48 (12.5%) 4 in 82 (4.8%) .11 5.40%
Bilateral fetal-type origin 8 in 14 (57.1%) 14 in 22 (63.6%) .482 61.10%
Bilaterally absent PcomA 6 in 13 (46.2%) 14 in 26 (53.8%) .455 51.30%
Note:—CoW indicates circle of Willis; MRI, MR imaging; AcomA, anterior communicating artery; PcomA, posterior communicating artery; ACA, anterior cerebral artery; PCA, posterior cerebral artery.
* Statistically significant.