The brain is unique in its structure and development. Unlike other organ systems in which the vascular tree arborises within the organs they perfuse, the cerebral blood vessels form a collateral network along the base of the brain with only the smaller vessels penetrating the brain substance. The larger vessels are contained within the subarachnoid space, a well formed compartment which contains circulating cerebrospinal fluid (CSF).1-3 Sheets of arachnoid partition the subarachnoid space into distinct chambers called cisterns. It is within this fragile network of arachnoidal reflections that a subarachnoid haemorrhage may occur.
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