Figure 1
From: Asymmetrical middle cerebral artery bifurcations are more vulnerable to aneurysm formation
(A) Schematic drawing shows measurement of bifurcation angles and vessel diameters. φ1, the angle formed between two M2 segments; φ2, the smaller angle formed between M1 and one M2 segment of middle cerebral artery (MCA); φ3, the larger angle between M1 and the other M2 segment of MCA; D1, the diameter of M1; D2, diameter of the smaller M2 branch; D3, diameter of the larger M2 branch. LA ratio was defined as φ3/φ2 and DA ratio was named as D3/D2. (B) LA and DA ratios of MCA bifurcations between normal and aneurysmal cases. Normal, control subjects without MCA aneurysms; total AN, MCA bifurcations harboring aneurysms. (C1,C2) Adjusted ROC curves of LA and DA ratios for predicting aneurysm presence. AUC, area under the curve. Differences were considered statistically significant at P < 0.05.
