From: Morphometry of cerebral arterial bifurcations harbouring aneurysms: a case-control study
parameter | patients w/ MCA An | patients w/ BA An | control patients | p value |
---|---|---|---|---|
BA | BA bifs w/ An | BA | ||
α angle (o) | 107.37 ± 19.27 | 136.68 ± 22.98 | 107.02 ± 23.55 | < 0.001 |
Φ1 angle (o) | 54.60 ± 20.23 | 71.70 ± 18.95 | 55.73 ± 19.19 | < 0.001 |
Φ2 angle (o) | 60.51 ± 17.87 | 77.07 ± 24.00 | 58.23 ± 20.82 | < 0.001 |
r0, mm | 1.57 ± 0.22 | 1.76 ± 0.36 | 1.58 ± 0.25 | < 0.05 |
r1, mm | 1.17 ± 0.21 | 1.31 ± 0.25 | 1.12 ± 0.22 | < 0.001 |
r2, mm | 0.96 ± 0.24 | 1.01 ± 0.23 | 0.92 ± 0.27 | NS |
asymmetry ratio, r22r1− 2 | 0.69 ± 0.21 | 0.62 ± 0.20 | 0.70 ± 0.25 | NS |
area ratio, (r12+r22)r0−2 | 0.94 ± 0.22 | 0.91 ± 0.23 | 0.90 ± 0.20 | NS |
n, junction exponent | 1.98 ± 0.74 | 1.90 ± 0.68 | 1.83 ± 0.62 | NS |
(ϕ1 + ϕ2) - α angle (o) | − 57.9 ± 26.2 | −87.2 ± 31.1 | −50.4 ± 27.7 | < 0.01 |
ϕ1 - Φ1 angle (o) | −30.2 ± 23.8 | −49.2 ± 19.9 | −30.5 ± 22.0 | < 0.05 |
ϕ2 - Φ2 angle (o) | −33.2 ± 20.7 | −48.4 ± 23.7 | − 28.0 ± 19.5 | NS |