الفهرس 
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Abstract
The present study includes 500 patients with SAH diagnosed by CT scanning and lumber puncture in CT negative cases. The incidence of SAH in our locality is 3.8 % of all strokes and , representing about 12.4 % of haemorrhagic strokes. The rate of SAH is highest in the sixth decade of life and, is more common in females than males. Hypertension, dyslipidemia, diabetes, and cigerrate smoking are the main risk factors in this study. Other risk factores including; hyperuricemia ; drug abuse , collagen disorder, and bleeding diathesis. SAH is more common during morning and afternoon periods while it showes reduced risk during night hours. 30 day case-Fatility is 46 % , the majority of them in the first week after admission due to rebleeding and the effect of this initial heamorrhage.