Normal Anatomical Features and Variations of the Vertebrobasilar Circulation and Its Branches: An Analysis with 64-Detector Row CT and 3T MR Angiographies
Figure 6
Axial MIP (a) and posteroanterior view VR (b) CT angiography images show a right PCA with fetal origin in a 42-year-old man. The P1 segment of the right PCA is agenetic, and there is a well-developed right PCoA that supplies the P2 and distal segments of the right PCA. The P1 segment of the left PCA is patent, and there is a thin calibrated left PCoA. Thick short arrows = right and left SCAs, thin short arrows = right and left PCAs, arrowheads = right and left PCoAs, and R = right.
