Subarachnoid hemorrhage occurs when there is bleeding into the space between the two innermost protective coverings surrounding the brain, the pia mater and the arachnoid mater. A subarachnoid hemorrhage most often occurs as the result of significant head trauma and is usually seen in the setting of skull fractures or injuries to the brain itself. In this setting, the presence of a subarachnoid hemorrhage has been linked to significantly worse outcomes, although it is unclear whether the presence of the blood in ...

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