[Subarachnoid hemorrhage: neurosurgical treatment modalities and etiological analysis].

Introduction: The subarachnoid hemorrhage (SAH) is excess presence of blood in the subarachnoid space. The most frequent cause of SAH is cerebral aneurysm rupture and neurotrauma. The treatment strategy is specific for the different forms of SAH but all therapeutic options are based on the prevention of secondary ischemic brain injury generating after initial hemorrhage.