Probability (out of 1.00) to have anterior communicating artery complex aneurysms in relation to the degree of right and left asymmetricity of A1 ACA
A1 asymmetry ratio (right and left bigger to smaller A1) | AcomA complex aneurysm | Total | % Chance | OR | χ2 (asymptotic significance); p value | |
No | Yes | |||||
No of cases; n=166 | ||||||
Mild to moderate (≤1.5) | 130 | 11 | 141 | 7.8 | 0.02 | 0.0001 |
Substantial to severe (>1.5) | 5 | 20 | 25 | 80.0 | 47.3 | 0.0001 |
Total | 135 | 31 | 166 | |||
No of cases without history of aneurysm (n=115) | ||||||
Mild to moderate (≤1.5) | 93 | 7 | 100 | 7.0 | 0.027 | 0.0001 |
Substantial to severe (>1.5) | 4 | 11 | 15 | 73.3 | 36.53 | 0.0001 |
Total | 97 | 18 | 115 | |||
No of cases with history of aneurysm (n=51) | ||||||
Mild to moderate (≤1.5) | 37 | 4 | 41 | 9.6 | 0.012 | 0.0001 |
Substantial to severe (>1.5) | 1 | 9 | 10 | 90.0 | 83.25 | 0.0001 |
Total | 38 | 13 | 51 |
n=166, without history of aneurysms (n=115), with the previous history of aneurysm (n=51).
A1 ACA, first segment of the anterior cerebral artery; AcomA, anterior communicating artery.