Computerized tomography in subarachnoid hemorrhage

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Abstract
Fifty patients with spontaneous subarachnoid hemorrhage were investigated by both computerized tomography (CT), within 5 days of onset, and complete cerebral angiography. CT showed blood in the basal cisterns in 38 of the 42 patients with a demonstrable aneurysm, but in only 1 of 8 patients with a negative angiogram (p < 0.001). This means that: (1) blood in the basal cisterns on CT almost certainly indicates a ruptured aneurysm, and (2) unexplained subarachnoid hemorrhages are unlikely to be caused by occult basal aneurysms.

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