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自发性蛛网膜下腔出血(SAH)的病人中,15％～20％的首次血管造影不能发现动脉瘤。根据早期CT扫描上的出血类型,这些病例可分为两类,即局限于中脑环池的出血和弥漫性基底地或限于其前部的出血。1 局限于中脑环池的出血 局限于中脑周围,占无可见性动脉瘤之SAH病例的2/3.主要包括持发性中脑周围出血,占全部SAH的10％,其中2/3的血管造影正常。各年龄均可发病,但以60岁以上者居多。仅少数有高血压史,缺乏动脉瘤性SAH时的“预警性头痛”史,1/3在剧
In patients with spontaneous subarachnoid hemorrhage (SAH), 15% to 20% of first angiograms can not detect aneurysms. According to the type of bleeding on the early CT scan, these cases can be divided into two categories, namely, bleeding limited to the mesolimbic pool and diffuse basement or bleeding limited to the front. 1 Bleeding confined to the midbrain cistern is confined to the midbrain, which accounts for two-thirds of all SAH-free aneurysms, including mainly mid-periventricular hemorrhage, which accounts for 10% of total SAH, of which 2/3 Angiography is normal. All ages can be disease, but more than 60 years of age. Only a few have a history of hypertension, a history of “early warning headache” when aneurysmal SAH is lacking, and 1/3