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Subarachnoid hemorrhage
A
subarachnoid hemorrhage
(
SAH
), or
subarachnoid haemorrhage
in
British English
, is
bleeding
into the
subarachnoid space
—the area between the
arachnoid membrane
and the
pia mater
surrounding the
brain
. This may occur spontaneously, usually from a ruptured
cerebral aneurysm
, or may result from
head injury
.
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