Subarachnoid hemorrhage (SAH) is the result of the bleeding within the subarachnoid space, which is filled with cerebrospinal fluid. It is a bleeding which is accumulated between the arachnoid and pia mater and can spread into intraventricular space, brain parenchyma and subdural space.
Excluding head trauma, sub arachnid hemorrhage mainly results from spontaneous rupture of a saccular aneurysm.
The exact pathogenesis of nonaneurysmal SAH (NASAH) is not fully understood. It is though that the mechanism of the bleeding in this type of subarachnoid hemorrhage is diverse. One of the most common subtype is called perimesencephalic nonaneurysmal subarachnoid hemorrhage (PM NASAH). It is characterized as localized specific blood  pattern on computed tomography (CT), normal cerebral angiography, and less sever symptoms and course of the condition.
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