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Anatomic Variants of the Major Intracranial Arteries [14]
| Artery | Variant | Frequency |
|---|---|---|
| Anterior cerebral (ACA) | Azygos ACA (unpaired ACA) | 0-5% |
| Medial ACA | 3-22% | |
| Bihemispheric ACA | 2-7% | |
| Persistent POA | Rare | |
| Middle Cerebral | Duplicated | 0.7-2.9% |
| Posterior cerebral (PCA) | Fetal PCA | 20 – 30% |
| Anastomoses internal carotid-basilar arteries | Persistent trigeminal artery | 0.1-1% |
| Persistent hypoglossal artery | 0.1-0.25% | |
| Proatlantal artery | Rare |
