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(3)Surgery for Unruptured Middle Cerebral Artery Aneurysm Masahito KAWABORI 1 , Ken KAZUMATA 1 , Kosuke OHNISHI 1 , Taku SUGIYAMA 1 , Masaki ITOH 1 , Naoki NAKAYAMA 1 , Kiyohiro HOUKIN 1 1Department of Neurosurgery, Hokkaido University Graduate School of Medicine Keyword: complication , unruptured aneurysm , middle cerebral artery , surgery pp.731-740
Published Date 2012/8/10
DOI https://doi.org/10.11477/mf.1436101798

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  • Abstract
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 Although a large number of patients with unruptured middle cerebral artery (MCA) aneurysms (AN) have been treated by surgical clipping in Japan, there has yet been no comprehensive study investigating the surgical risks based on a quantitative evaluation of the extensive existing body of patient records. This systematic review was conducted to determine morbidity of the procedure by performing a meta-analysis of the literature. The authors used a PubMed and J-stage search from 2000 to 2011 for studies containing the surgical clipping of the unruptured MCA AN. There were 21 articles, containing a total 1,323 cases of unruptured AN with morbidity specifically located in the MCA. 54 cases indicated significant neurological deficits for a morbidity rate of 4.1% (95% CI; 3.0-5.1). A limited number of studies disclosed an incremental increase in morbidity with the size of the aneurysm. Smaller MCA AN (7±3 mm) presented a lower morbidity of 1.48%, whereas giant MCA AN (>25 mm) corresponded with a higher morbidity of 27.8%. Factors consistently associated with high morbidity included incorporated MCA branches, plaque at the neck of the AN, an unclippable configuration, and M1 superior wall AN. Complex aneurysms required a wide array of intracranial bypass procedures, yielding morbidity of 23.4% (95% CI; 20.9-25.9). This is the first systematic review and quantitative meta-analysis of the surgical complications related to unruptured MCA AN.


Copyright © 2012, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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