Objective: In this study the factors that affect the prognosis in aneurysm based spontaneous surbarachnoid hemorrhage are reviewed accompanied by the literature.

Materials and Methods: 328 SAH cases who were referred to our hospital between January 1995-2005, were analyzed retrospectively in terms of aetiological, clinical and radiological findings. Female/Male rate was found as 1,2. Ages of the patients were changing from 4 to 93. Neurological evaluations of the patients were made according to the Glasgow Coma Scale and Yasargil criteria; and CT findings were evaluated according to the Fisher classification. Besides we analyzed the relation between age, gender and season. The results were discussed by taking the literature into account.

Results: The most frequent reason of spontaneous surbarachnoid hemorrhage caused by aneurysm is the anterior communicane artery aneurysm. The average age was determined as 48.6. The most common complaint of the patients when they were referred to our clinic was headache (70.1%). SAH diagnosis was done via cranial CT for 305(93%) cases of all 328 cases. The frequency of observation of SAH seemed to be on increase especially in autumn. According to the Yasargil classification; the most common phase that observed in the cases was ‘ Phase 2a' , and according to Fisher classification the most common phase was ‘Phase 2'.

Conclusion: CT is the most common method to diagnose SAH in the first 72 hours. Magnetic Resonance or Lomber Puncture should be applied when diagnose is not possible with CT. Digital substraction angiography is the first.