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. 2009 Nov-Dec;30(10):1955–1962. doi: 10.3174/ajnr.A1724

Fig 2.

Fig 2.

Axial MIP images of different anatomic variations of the CoW in the neonatal brain. A, Hypoplastic right A1 segment of the ACA (thin arrow) and bilateral fetal-type origin of the PCA with bilaterally hypoplastic P1 segments (thick arrows) and enlarged PcomAs (block arrows). B, Unilateral (left) fetal-type origin of the PCA with the PcomA diameter (thin arrow) larger than the P1 diameter. C, Clearly present AcomA (arrowhead) with bilaterally absent PcomAs. D, Absent right A1 segment (arrowhead), and bilateral fetal-type origin of the PCA (block arrows) with absent P1 segments. The whole of the anterior circulation originates from the enlarged left ACA.