[Subarachnoid hemorrhage caused by rupture of cerebral aneurysm. Value of neuroradiological studies].

The role of neuroradiological examinations in the diagnosis and in the therapeutical indication of intracranial aneurysm are analyzed and discussed on the basis of a large review of the literature. Skull X-rays, Ct scan with and without intravenous contrast enhancement, magnetic resonance imaging and angiographic have different role and different timing. They are critically evaluated in order to point out an up-to-date diagnostic phase.