뇌동맥류는 볼록하게 부푼 혈관 부위의 지름이 6∼7 mm 정도로 크고, 모양이 울퉁불퉁할수록 터질 확률이 높다.
The convex and swollen blood vessel of a cerebral aneurysm has a diameter as large as 6 to 7 mm, and the more irregular its shape, the higher the probability of it bursting.