Angiographic findings in 130 patients with aneurysmal subarachnoid hemorrhage

To evaluate the distribution and multiplicity of intracranial aneurysms in patients with aneurysmal subarachnoid hemorrhage (SAH) and to characterize the age and sex distribution of these patients. We reviewed 130 patients with aneurysmal SAH documented by cerebral digital subtraction angiography (DSA). The mean age of patients was 45.8 years, with a female to male ratio of 0.68. In 13 (10%) patients there were multiple aneurysms. In 7 (5.4%) patients a giant aneurysm was discovered. Of 143 documented aneurysms found in 130 patients, the most frequent locations were anterior communicating artery (AComA) (29.4%), middle cerebral artery (MCA) bifurcation (21.0%), posterior communicating artery (PComA) (4.7%), internal carotid artery (ICA) bifurcation (9.8%), basilar tip (5.6%), pericallosal artery (5.6%), M1 segment of ICA (excluding ophthalmic and PComA origin) (2.8%), cavernous portion of ICA (2.8%), and ophthalmic artery origin of ICA (2.1%). The least common site for aneurysm was posterior inferior cerebellar artery (PICA) origin (1.4%). Our findings of the distributions of the aneurysms and the female to male ratio, suggest a contribution of ethnic background, which may need to be considered in diagnosis of these patients.