Arachnoid under the cavity hemorrhage (SAH) usually is the brain base aneurism or brain artery abnormally bursts, the blood direct inflow arachnoid under cavity is the result of.

• 蛛网膜下腔出血(SAH)通常是脑底部动脉瘤或脑动脉畸形破裂,血液直接流入蛛网膜下腔所致。