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Figure 1: Various types of vertebral artery (VA) anomalies in cases of congenital atlantoaxial dislocation (CAAD) have been shown in posterior and lateral views. The right - side VA shows the normal course for comparison with each type of VA anomaly on the left side. (FIA = Persistent first intersegmental artery, PICA = Posterior inferior cerebellar artery)

Figure 1: Various types of vertebral artery (VA) anomalies in cases of congenital atlantoaxial dislocation (CAAD) have been shown in posterior and lateral views. The right - side VA shows the normal course for comparison with each type of VA anomaly on the left side. (FIA = Persistent first intersegmental artery, PICA = Posterior inferior cerebellar artery)