[Subarachnoid hemorrhage caused by cerebral arteriovenous malformations. Importance of neuroradiological studies]

The role of skull X-rays, CT scan with and without intravenous contrast enhancement, angiography, digital subtraction angiography and magnetic resonance imaging in the morphological and topographical evaluation of arteriovenous malformation are analyzed and discussed. The literature on this subject is critically reviewed. Venous angioma, cavernoma, dural fistula and arteriovenous malformation with no angiographical evidence, are examined with special attention.