Basic patterns of the small side branches of the basilar artery in 2k DSA and 3DRA imaging studies
| Number of Segmental Arteries Right | Number of Segmental Arteries Left | Direct Pontine Perforators | Collateralsa | Common Trunks of Circumferential Arteries | Pial Network | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0–3 | 4–7 | 8–10 | 0–3 | 4–7 | 8–10 | Caudal | Medial | Rostral | ||||
| 2k DSA | 10 | 7 | 3 | 5 | 11 | 4 | 0 | 0 | 0 | 6 | 8 | 1 |
| 3DRA | 6 | 13 | 1 | 5 | 13 | 2 | 20 | 20 | 20 | 11 | 10 | 6 |
↵a Collaterals are defined as small anastomosis with a descending course connecting 2 adjacent circumferential arteries.