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Objective: Subarachnoid hemorrhage (SAH) may arise due to trauma or spontaneously, and is a medical emergency which can lead to death or severe disability even if recognized and treated in an early stage. In this study 105 SAH patients,consulted and diagnosed by neurology and neurosurgery clinics in our hospital between January 2005 and January 2008,evaluated to determine etiopathologic and clinical manifestations. Materials and Methods: Clinical records,neuro-imaging and CSF reports of patients were reviewed. Cranial CT scanning performed in all patients at administration.For further evaluation cerebral anjiography used in 98 patients (%93.3) and lumbar puncture in 3 patients. Results: We detected intracranial aneurysms as the most common pathology (86.6 %),trauma and arteriavenous malformations consecutively. SAH severity was assessed according to Yasargil SAH Grading scale. We found out middle cerebral artery aneurysm in 31 patients (34%),anterior communican artery aneurysm in 23 patients ( 25.2 %),internal carotis artery aneurysm in 8 patients (8.8 %),posterior communican artery aneurysm in 7 patients (7.69%),anterior cerebral artery aneurysm in 5 patients ( 5.4 %), basillary artery aneurysm in 3 patients (3.29 %), anterior coroidal artery aneurysm in 1 patient(1.09 %). Conclusions: Our study confirms earlier studies reporting the most common cause of SAH is intracranial aneurysms (86.6 %). The diagnosis of SAH usually depends on a high index of clinical suspicion combined with radiographic confirmation via CT scan without contrast.After the diagnosis of SAH, further imaging should be performed to characterize the source of the hemorrhage. This effort can include standard angiography, CT angiography, and lumbar puncture.period in female migraine patients. The examination of serum sex hormones levels can be useful to determine the etiopathogenesis and treatment in female migraine patients. [ABSTRACT FROM AUTHOR]