title: Normal cerebral arteriography in patients with spontaneous subarachnoid hemorrhage.
abstract: Previous studies have reported that 18 to 27% of patients with spontaneous subarachnoid hemorrhage have normal cerebral arteriograms. Our series of 220 patients from three hospitals demonstrated normal arteriograms in only 16 (7%). Recent improvements in neuroradiologic techniques, such as femoral catheterization, magnification angiography, oblique and basal projections, and subtraction most probably contribute to the improved yield. Nonvisualization of a cerebral aneurysm probably represents the most common explanation for a normal cerebral arteriogram.
mesh_terms: D002533:Cerebral Angiography / Q000379:methods; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging; D013345:Subarachnoid Hemorrhage / Q000000981:diagnostic imaging*