Table 2

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 aneurysmTotal% ChanceORχ2 (asymptotic significance); p value
NoYes
No of cases; n=166
 Mild to moderate (≤1.5)130111417.80.020.0001
 Substantial to severe (>1.5)5202580.047.30.0001
 Total13531166
 No of cases without history of aneurysm (n=115)
 Mild to moderate (≤1.5)9371007.00.0270.0001
 Substantial to severe (>1.5)4111573.336.530.0001
 Total9718115
 No of cases with history of aneurysm (n=51)
 Mild to moderate (≤1.5)374419.60.0120.0001
 Substantial to severe (>1.5)191090.083.250.0001
 Total381351
  • 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.