caa a22 4500 477108172 CHVBK 20180405111601.0 cr unu---uuuuu 170330e19960801xx s 000 0 eng 10.1007/BF01411285 doi (NATIONALLICENCE)springer-10.1007/BF01411285 Cerebral aneurysms unrelated to arterial bifurcations [Elektronische Daten] [Y. Yoshimoto, C. Ochiai, M. Nagai] Summary: The majority of saccular cerebral aneurysms arise at arterial branchings; those arising elsewhere are rare. Among 557 saccular cerebral aneurysms surgically treated between 1983 and 1994, 29 (5.2%) were unrelated to arterial divisions. These cases were retrospectively analysed. The ages of the subjects ranged from 6 to 80 years (mean 57); 17 (59%) were female, and 12 (41%) male. Twenty-four (83%) presented with subarachnoid haemorrhage. Seventeen (59%) had a history of hypertension, and ten (34%) had multiple cerebral aneurysms. The most common site was the internal carotid artery (45%), followed by the middle cerebral artery (28%), the vertebrobasilar arteries (17%), and the anterior cerebral artery (10%). The aneurysms were classified in relation to arterial curvature into three groups: dorsal curvature (41%), ventral curvature (10%) and non-curvature (49%). During surgery, sclerotic changes were noted in the arterial wall adjacent to the aneurysms in 14 patients (48%). Five cases (17%) had small thin walled (blisterlike) aneurysms, four of which ruptured during surgery resulting in poor clinical outcomes. We suggest that arteriosclerotic changes in the arterial wall, carotid siphon, and/or local haemodynamic forces are important factors in the development of this type of aneurysms. At surgery, one should bear in mind the possibility of sclerotic or blister-like aneurysms which require special attention to deal with them. Springer-Verlag, 1996 Arteriosclerosis nationallicence curvature aneurysms nationallicence haemodynamic stress nationallicence Yoshimoto Y. Department of Neurosurgery, Dokkyo University School of Medicine, Tochigi, Japan aut Ochiai C. Department of Neurosurgery, Dokkyo University School of Medicine, Tochigi, Japan aut Nagai M. Department of Neurosurgery, Dokkyo University School of Medicine, Tochigi, Japan aut Acta Neurochirurgica Springer-Verlag 138/8(1996-08-01), 958-964 0001-6268 138:8<958 1996 138 701 https://doi.org/10.1007/BF01411285 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01411285 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yoshimoto Y. Department of Neurosurgery, Dokkyo University School of Medicine, Tochigi, Japan aut NATIONALLICENCE 700 1- Ochiai C. Department of Neurosurgery, Dokkyo University School of Medicine, Tochigi, Japan aut NATIONALLICENCE 700 1- Nagai M. Department of Neurosurgery, Dokkyo University School of Medicine, Tochigi, Japan aut NATIONALLICENCE 773 0- Acta Neurochirurgica Springer-Verlag 138/8(1996-08-01), 958-964 0001-6268 138:8<958 1996 138 701 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer