Table 4:

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.