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Associations between an abnormal origin and an abnormal penetration of the VA into the transforamen
| MRA | Total | |||
|---|---|---|---|---|
| V2 anomaly (+) | V2 anomaly (−) | |||
| CTA | V1 anomaly (+) | 8 (1.7%) | 3 (0.6%) | 11 (2.3%) |
| V1 anomaly (−) | 19 (4.0%) | 446 (93.7%) | 465 (97.7%) | |
| Total | 27 (5.7%) | 449 (94.3%) | 476 (100%) | |
P for chi-square < 0.001
V1 VA with aortic origin in V1 segment, V2 VA with an abnormal entrance into the C6 transverse foramen
