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A female patient with middle cerebral artery aneurysm was followed up by clinical visiting. The patient had hypertension history. Based on the first CTA, SR, DA, LSAR, and OSI were 4.6, 42°, 0.74 and 0.22, respectively (c.1,3,4,5,6). The aneurysm was scored by the IARS as 4, which was stratified as high-risk group. 3.5 months later, the aneurysm was rupture. SAH and hemotoma were confirmed by CT (c.2).
