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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 CoW9 in 24 (37.5%)11 in 26 (42.3%).477
AcomA absence/hypoplasia6 in 24 (25%)6 in 26 (23.1%).567
PcomA absence/hypoplasia13 in 48 (27%)18 in 52 (34.6%).276
A1 segment of ACA absence/hypoplasia5 in 48 (10.4%)1 in 52 (1.9%).053*
P1 segment of PCA absence/hypoplasia4 in 48 (8.3%)3 in 52 (5.7%).455
Fetal-type origin of PCA14 in 48 (29%)12 in 52 (23%).321
Transitional-configuration origin of PCA6 in 48 (12.5%)5 in 52 (9.6%).443
Bilateral fetal-type origin8 in 14 (57.1%)6 in 12 (50%).512
Bilaterally absent PcomA6 in 13 (46.2%)14 in 18 (77.8%).076
  • * Statistically significant.