Subarachnoid haemorrhage (SAH) is a multiaetiological condition. The 1966 Cooperative Study recorded 6368 patients with spontaneous SAH over an eight year period. Of these, 51% had cerebral aneurysms.4 Stehbens reviewed 11 series from 1950 to 1969 and found cerebral aneurysms to be the cause of SAH in 18-76% of cases.5 Other aetiologies included trauma, cerebral and spinal vascular malformations, intrinsic and extrinsic cranial and spinal neoplasms, pathological and iatrogenic coagulopathy, vasculitis, collagen vascular disease, sickle cell anaemia, cerebral infarction, and drug abuse.

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