90.5% aneurysms were discoved by ruptured in which 19% patients were estimated at grade 3, and 9.5% were unruptured.
90,5% bệnh nhân phát hiện do vỡ túi phình; 9,5% túi phình chưa vỡ. Trong đó 81% ở độ 1-2 hay chưa vỡ, 19% độ 3.