TABLE 2.
Distribution of circle of Willis variants in stroke and transient ischemic attack patients
| Stroke cohort |
All (n = 193) |
TIA cohort |
All (n = 73) |
|---|---|---|---|
| CoW, n (%) | |||
| Incomplete/differing a | 159 (82.4) | Incomplete/differing a | 53 (72.6) |
| Anterior CoW, n (%) | |||
| A1 or Acom incomplete/differing | 77 (39.9) | A1 or Acom incomplete/differing | 33 (45.2) |
| A1 or Acom hypoplastic | 65 (33.7) | A1 or Acom hypoplastic | 30 (41.1) |
| A1 or Acom aplastic | 15 (7.8) | A1 or Acom aplastic | 3 (4.1) |
| A1‐asymmetry | 26 (13.5) | A1‐asymmetry | 10 (13.7) |
| A1‐asymmetry (ipsilateral) | 15 (7.8) | A1‐asymmetry (ipsilateral) | NA |
| A1 hypoplastic (ipsilateral) | 9 (4.7) | A1 hypoplastic | 8 (11) |
| A1 aplastic (ipsilateral) | 6 (3.1) | A1 aplastic | 2 (2.7) |
| Acom differing | 59 (30.6) | Acom differing | 23 (31.5) |
| Acom hypoplastic | 54 (28.0) | Acom hypoplastic | 22 (30.1) |
| Acom aplastic | 5 (2.6) | Acom aplastic | 1 (1.4) |
| Azygos variant | 2 (1) | Azygos variant | 1 (1.4) |
| Posterior CoW, n (%) | |||
| P1 or Pcom incomplete/differing | 149 (77.2) | P1 or Pcom incomplete/differing | 43 (58.9) |
| P1 or Pcom incomplete/differing (ipsilateral) | 105 (54.4) | P1 or Pcom incomplete/differing (ipsilateral) | NA |
| P1 or Pcom hypoplastic | 114 (59.1) | P1 or Pcom hypoplastic | 32 (43.8) |
| P1 or Pcom hypoplastic (ipsilateral) | 74 (38.3) | P1 or Pcom hypoplastic (ipsilateral) | NA |
| P1 or Pcom aplastic | 55 (28.5) | P1 or Pcom aplastic | 12 (16.4) |
| P1 or Pcom aplastic (ipsilateral) | 31 (16.1) | P1 or Pcom aplastic (ipsilateral) | n.a. |
| P1 or Pcom one‐sided differing | 60 (31.1) | P1 or Pcom one‐sided differing | 29 (39.7) |
| P1 or Pcom two‐sided differing | 89 (46.1) | P1 or Pcom two‐sided differing | 14 (19.2) |
| Pcom differing (ipsilateral) | 95 (49.2) | Pcom differing | 39 (53.4) |
| Pcom hypoplastic (ipsilateral) | 64 (33.2) | Pcom hypoplastic | 28 (38.4) |
| Pcom aplastic (ipsilateral) | 31 (16.1) | Pcom aplastic | 12 (16.4) |
| Full fetal PCA | 21 (10.9) | Full fetal PCA | 4 (5.5) |
| Full fetal PCA (ipsilateral) | 11 (5.7) | Full fetal PCA (ipsilateral) | NA |
| Partial fetal PCA | 54 (28.0) | Partial fetal PCA | 16 (21.9) |
| Partial fetal PCA (ipsilateral) | 38 (19.7) | Partial fetal PCA (ipsilateral) | NA |
Abbreviations: Acom, anterior communicating artery; CoW, circle of Willis; NA, not applicable; PCA, posterior cerebral artery; Pcom, posterior communicating artery; TIA, transient ischemic attack.
a
Including all CoW variants.