Review Article
Unilateral Aplasia versus Bilateral Aplasia of the Vertebral Artery: A Review of Associated Abnormalities
Table 8
Single left VA aplasia versus right VA aplasia.
| | Number | Parameters | Left VA aplasia | Right VA aplasia | | 46 cases | 31 cases |
| | (1) | Incidence | 59.74% | 40.26% |
| | (2) | Gender | | | | | Female | 31.16% | 18.18% | | Male | 25.97% | 18.18% | | Female/male/unknown gender | 49.34%/44.15%/6.49% |
| | (3) | Persistence of CVBA | | | | | Unilateral persistence of CVBA | 82.60% | 80.64% | | | Bilateral persistence of CVBA | 4.34% | 0 | | | Persistence of two different CVBA | 4.34% | 0 | | | Persistence of determined CVBA | | | | | PPIA | 43.47% | 16.13% | | PPHA | 34.78% | 51.61% | | PPTA | 13.04% | 6.45% | | Unusual arterial anastomoses | 0 | 6.45% |
| | (4) | Additional vascular variants | | | | Associated aplasia of other blood vessels | Uni- | Bi- | Uni- | Bi- | Uni- | Bi- | | CCA | | 3.22% | | 3.22% | | | ECA | | | | | 3.22% | | ICA | | 6.45% | | 6.45% | | | ACA | | 3.22% | | 3.22% | | | PCoA | PCoAs | 8.69% | | 12.90% | 6.45% | | BA | | 3.22% | | AICA | | 3.22% | | | | | SA trunk | | 3.22% | | | | | SA branches | | | | 3.22% | | | | Hypoplastic (opposite) VA | 34.78% | 41.93% | | | Unusual origin or side branches or termination or additional anastomoses | 39.13% | 32.25% |
| | (5) | Associated vascular pathology | | | | Aneurysms of definitive arteries | 8.69% | 25.80% | | | Aneurysms of CVBAs | 4.34% | 3.22% | | | Other cerebral pathology | 41.30% | 35.48% | | | Noncerebral pathology | 4.34% | 9.67% |
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VA, vertebral artery; CVBA, carotid-vertebrobasilar anastomosis; PPIA, persistent primitive proatlantal intersegmental artery; PPHA, persistent primitive hypoglossal artery; PPTA, persistent primitive trigeminal artery; CCA, common carotid artery; ECA, external carotid artery; ICA, internal carotid artery; ACA, anterior cerebral artery; PCoA, posterior communicating artery; BA, basilar artery; SA, subclavian artery.
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