Circle of Willis | Other pathways | Total | |||
---|---|---|---|---|---|
None | Oph only | LM only | Both | ||
Values are mean (SD). ACoA, anterior communicating artery; PCoA, posterior communicating artery; Oph, ophthalmic artery; LM, leptomeningeal anastomosis. | |||||
ACoA only | 9 | 2 | 0 | 2 | 13 |
PCoA only | 3 | 4 | 5 | 1 | 13 |
Both ACoA and PCoA | 3 | 1 | 1 | 0 | 5 |
No collateral flow | 0 | 3 | 6 | 2 | 11 |
Total | 15 | 10 | 12 | 5 | 42 |