CT of pronounced subarachnoid hemorrhage.

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The subarachnoid space, in which the cerebrospinal fluid (CSF) normally circulates, is largely filled with blood (white in cranial computed tomography). The cause of subarachnoid hemorrhage is, in most cases, the bursting of an arterial vessel due to a cerebral aneurysm. Large accumulations of blood lead to adhesions in the basal cisterns and impair the circulation of CSF, which can lead to hydrocephalus. The leaked blood and its degradation products typically result in vasospasm of large arteries supplying the brain between the 4th and 12th day after the bleeding event. These vasospasms can lead to reduced cerebral perfusion and consequently to cerebral damage (cerebral insult).



© Wolfgang Schramm (2008)

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