Review Article
Unilateral Aplasia versus Bilateral Aplasia of the Vertebral Artery: A Review of Associated Abnormalities
Table 7
Single right VA aplasia versus bilateral VA aplasia.
| | Number | Parameters | Right VA | Bilateral VA | | 31 cases | 31 cases |
| | (1) | Incidence | 40.32% | 59.68% |
| | (2) | Gender | | | | | Female | 22.58% | 17.74% | | Male | 22.58% | 30.64% | | Female/male/unknown gender | 40.32%/53.12%/6.45% |
| | (3) | Persistence of CVBA | | | | | Unilateral persistence of CVBA | 80.64% | 59.07% | | | Bilateral persistence of CVBA | 0 | 34.48% | | | Persistence of two different CVBAs | 0 | 3.22% | | | Persistence of determined CVBA | | | | | PPIA | 16.13% | 54.83% | | | PPHA | 51.61% | 32.25% | | | PPTA | 6.45% | 9.67% | | | Unusual arterial anastomoses | 6.45% | 6.45% |
| | (4) | Additional vascular variants | | | | | | | Associated aplasia of other vessels | Uni- | Bi- | Uni- | Bi- | Uni- | Bi- | | | ECAs | | 3.22% | | | | ICA | | 6.45% | | | | | ACA | | 3.22% | | | | | PCoA | PCoAs | 12.90% | 6.45% | 3.22% | 9.67% | | BA | 3.22% | 3.22% | | SA branches | | 3.22% | | | | | | Hypoplastic left VA | 41.93% | | | | Unusual origin or side branches or termination or hypoplasia of other arteries or additional anastomoses | 32.25% | 41.93% |
| | (5) | Associated vascular pathology | | | | | Aneurysms of definitive arteries | 25.80% | 16.13% | | | Aneurysms of CVBAs | 3.22% | 3.22% | | | Different cerebral pathology (except that of cerebral aneurysms) | 35.48% | 35.48% | | | Noncerebral pathology | 9.67% | 3.22% |
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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; ICA, internal carotid artery; ACA, anterior cerebral artery; PCoA, posterior communicating artery; BA, basilar artery; AICA, anterior inferior cerebellar artery; SA, subclavian artery.
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