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The number and rate of forming the circle of Willis arteries.
| Complete polygon (with hypoplasia) | 71 (71%) |
| Complete polygon (without hypoplasia) | 28 (28%) |
| Incomplete polygon (with aplasia) | |
| Anterior segment | 7 |
| Posterior segment | 21 |
| Anterior-Posterior | 1 |
| Total | 29 (29%) |
