caa a22 4500 477108032 CHVBK 20180405111601.0 cr unu---uuuuu 170330e19960801xx s 000 0 eng 10.1007/BF01411286 doi (NATIONALLICENCE)springer-10.1007/BF01411286 Types of unruptured cerebral aneurysms reviewed from operation video-recordings [Elektronische Daten] [K. Mizoi, T. Yoshimoto, Y. Nagamine] Summary: To estimate the proportion of unruptured cerebral aneurysms with thin-walled sac, we have analyzed the operative findings of 78 incidental cerebral aneurysms found in 51 consecutive surgical cases by reviewing of intra-operative videotape recordings. Among 78 unruptured aneurysms, 23 (30%) were evaluated as thick-walled aneurysms (Type A), 39 (50%) with partially thin-walled sac (Type B) and 16 (20%) with entirely thin wall sacs (Type C). The mean size of Type A aneurysms was 10.4 mm (ranging from 3 to 22 mm), in Type B it was 9.8 mm (ranging 4 to 25 mm) and in Type C it was 4.4 mm (between 2-12 mm). Approximately two-thirds of Type C aneurysms were 4 mm in size or smaller, and Type C aneurysms were significantly smaller than Type A aneurysms. In summary, this preliminary study has provided two original data. 1) About 70% of incidental unruptured aneurysms have a partially or entirely thin-walled sac. 2) Many of the small aneurysms have an entirely thin sac. Assuming that thin-walled aneurysms are at a high risk of subsequent rupture, the surgical intervention for incidental unruptured aneurysms may be recommended irrespective of their size if the surgical risk is considered low. Springer-Verlag, 1996 Unruptured cerebral aneurysms nationallicence surgical video-recording: mural thickness nationallicence surgical indication nationallicence Mizoi K. Department of Neurosurgery, Tohoku University School of Medicine, Sendai aut Yoshimoto T. Department of Neurosurgery, Tohoku University School of Medicine, Sendai aut Nagamine Y. Department of Neurosurgery, Kohnan Hospital, Sendai, Japan aut Acta Neurochirurgica Springer-Verlag 138/8(1996-08-01), 965-969 0001-6268 138:8<965 1996 138 701 https://doi.org/10.1007/BF01411286 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01411286 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mizoi K. Department of Neurosurgery, Tohoku University School of Medicine, Sendai aut NATIONALLICENCE 700 1- Yoshimoto T. Department of Neurosurgery, Tohoku University School of Medicine, Sendai aut NATIONALLICENCE 700 1- Nagamine Y. Department of Neurosurgery, Kohnan Hospital, Sendai, Japan aut NATIONALLICENCE 773 0- Acta Neurochirurgica Springer-Verlag 138/8(1996-08-01), 965-969 0001-6268 138:8<965 1996 138 701 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer