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What is a subarachnoid haemorrhage (SAH)?

April 26, 2017haemorrhage sah subarachnoid

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What is a subarachnoid haemorrhage (SAH)?

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A subarachnoid haemorrhage (SAH) is a sudden leak of blood over the surface of the brain. The brain is covered by layers of membranes, one of which is called the arachnoid. An SAH occurs beneath this layer. The blood vessels supplying blood to the brain lie in this space, surrounded by clear cerebrospinal fluid. SAH is a medical emergency. It is a serious, life-threatening condition.