Figure 4
From: Asymmetrical middle cerebral artery bifurcations are more vulnerable to aneurysm formation
Multiple regression analysis shows correlation of angle φ1 with age and vessel diameter (D1, D2 and D3) in all patients or with aneurysm size in patients with middle cerebral artery (MCA) bifurcation aneurysms, as well as correlation of angles φ2 and φ3 with age. Aneurysm size was represented by aneurysm maximum width × maximum height. φ1, the angle formed between two M2 segments; φ2, the smaller angle formed between M1 and one M2 segment of MCA; φ3, the larger angle between M1 and the other M2 segment of MCA; D1, D2 and D3, diameter of the M1, smaller M2 and larger M2 segments, respectively. Differences were considered statistically significant at P < 0.05.
