Table 2 Characteristics of the surrounding vasculature for basilar tip aneurysms (BTAs) and non-basilar tip aneurysms (non-BTAs) (N = 313).
From: Surrounding vascular geometry associated with basilar tip aneurysm formation
Variables | All N = 313 | BTA N = 207 | Non-BTA N = 106 | P-value |
|---|---|---|---|---|
Hypoplastic PCoA (%) | ||||
No | 194 (62.0) | 121 (58.5) | 73 (68.9) | 0.07 |
Unilateral | 63 (20.1) | 46 (22.2) | 17 (16.0) | 0.20 |
Bilateral | 56 (17.9) | 40 (19.3) | 16 (15.1) | 0.36 |
Aplastic PCoA (%) | ||||
No | 301 (96.2) | 195 (94.2) | 106 (100.0) | 0.02 |
Unilateral | 8 (2.6) | 8 (3.9) | 0 (0.0) | 0.04 |
Bilateral | 4 (1.3) | 4 (1.9) | 0 (0.0) | 0.15 |
Fetal PCoA (%) | ||||
No | 287 (91.7) | 190 (91.8) | 97 (91.5) | 0.93 |
Unilateral | 20 (6.4) | 12 (5.8) | 8 (7.5) | 0.56 |
Bilateral | 6 (1.9) | 5 (2.4) | 1 (0.9) | 0.36 |
Vertebral dominance (%) | 70 (22.4) | 43 (20.8) | 27 (25.5) | 0.35 |
Daughter diameter ratio (larger/smaller) (SD) | 1.19 (0.26) | 1.18 (0.22) | 1.22 (0.33) | 0.18 |
Basilar artery diameter in mm (SD) | 2.54 (0.46) | 2.49 (0.46) | 2.64 (0.44) | 0.01 |
Diameter size ratio (Parent/(D1 + D2)) | 0.74 (0.11) | 0.71 (0.11) | 0.80 (0.10) | < 0.01 |
Daughter–daughter angle in degrees (SD) | 124.58 (29.03) | 139.5 (21.6) | 95.5 (17.3) | < 0.01 |
Parent–daughter angle ratio (SD) | 1.27 (0.63) | 1.34 (0.77) | 1.15 (0.13) | 0.01 |
