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自发性蛛网膜下腔出血是由于软脑膜上的血管破裂,血液直接流入蛛网膜下腔引起。脑出血(如高血压脑出血),血液穿破脑室或软膜,间接流入蛛网膜下腔称为继发性蛛网膜下腔出血不在本文内讨论。自发性蛛网膜下腔出血多由先天性脑底动脉瘤引起,其次是动脉硬化、血管畸形(血管瘤)。发病率占脑血管病的第三位(仅次于脑血栓、脑出血)。本病容易再发(约30%),死亡率亦高(约25%),
Spontaneous subarachnoid hemorrhage is due to rupture of blood vessels on the pia mater, the blood directly into the subarachnoid space. Cerebral hemorrhage (such as hypertensive intracerebral hemorrhage), the blood piercing the ventricles or soft membranes, indirect inflow into the subarachnoid space is called secondary subarachnoid hemorrhage is not discussed in this article. Spontaneous subarachnoid hemorrhage and more caused by congenital cerebral aneurysm, followed by atherosclerosis, vascular malformations (hemangiomas). The incidence of cerebrovascular disease accounted for the third (second only to cerebral thrombosis, cerebral hemorrhage). The disease is easy to relapse (about 30%), the mortality rate is also high (about 25%),