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Table 3: 
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 CoW7 in 19 (36.8%)11 in 22 (50%).298
AcomA absence/hypoplasia4 in 19 (21%)2 in 22 (9%).262
PcomA absence/hypoplasia15 in 38 (39.5%)11 in 44 (25%).122
A1 segment of ACA absence/hypoplasia0 in 38 (0%)1 in 44 (2%).537
P1 segment of PCA absence/hypoplasia2 in 38 (5.2%)2 in 44 (4.5%).635
Fetal-type origin of PCA12 in 38 (31.6%)10 in 44 (22.7%).257
Transitional-configuration origin of PCA1 in 38 (2.6%)3 in 44 (6.8%).365
Bilateral fetal-type origin10 in 12 (83.3%)4 in 10 (40%).048*
Bilaterally absent PcomA10 in 15 (66.7%)4 in 11 (36.4%).129
  • Note:—GA indicates gestational age.
  • * Statistically significant.