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CT and MR imaging findings and their implications in the follow-up of patients with intracranial aneurysms treated with endosaccular occlusion with onyx

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dc.contributor.author Saatci, Isil
dc.contributor.author Cekirge, Saruhan
dc.contributor.author Ciceri, Elisa F.M.
dc.contributor.author Mawad, Michel E.
dc.contributor.author Pamuk, A. Gulsun
dc.contributor.author Besim, Aytekin
dc.date.accessioned 2019-07-09T06:54:55Z
dc.date.available 2019-07-09T06:54:55Z
dc.date.copyright 2003 en_US
dc.identifier.issn 1936-959X en_US
dc.identifier.uri http://hdl.handle.net/10725/11003
dc.description.abstract BACKGROUND AND PURPOSE: Our purpose was to describe the CT and MR features of intracranial aneurysms occluded with the liquid polymer Onyx. METHODS: At two centers, 35 aneurysms in 33 patients and 11 in nine patients were treated with the polymer. In 17 patients, adjunctive stents were placed at the aneurysm neck. All but three aneurysms originated from the internal carotid artery (ICA). Eighteen were giant; 15, large; and 13, small. Patients underwent pre- and postprocedural CT and/or MR imaging; MR angiograms (MRAs) were available in 22. In 35 patients (38 aneurysms), 3-month and/or 1-year follow-up angiograms were obtained for correlation with sectional images. RESULTS: Except in two small aneurysms, polymer filling created beam hardening artifacts on CT scans. In 10 aneurysms, the polymer did not fill the aneurysm sac entirely; five showed recanalization at follow-up. On MR images (all sequences), the polymer appeared hypointense, probably because of its tantalum content; it did not create artifacts. MRAs falsely suggested reduced or absent ICA flow in 11 of 22 patients, nine of whom with stents. In the rest, MRA provided results comparable to those of selective angiography. In 12 patients, postprocedural imaging revealed new lesions. CONCLUSION: Onyx appears hypointense on MR images, with no artifact, and it does not interfere with MRA except in patients with stents. MR imaging may reveal new parenchymal lesions, even in asymptomatic patients. In the immediate control and follow-up of polymer-treated aneurysms, MR imaging and MRA may be preferred. CT may show the degree of filling in the aneurysmal sac, but Onyx creates artifacts that hinder CT evaluation. en_US
dc.language.iso en en_US
dc.title CT and MR imaging findings and their implications in the follow-up of patients with intracranial aneurysms treated with endosaccular occlusion with onyx en_US
dc.type Article en_US
dc.description.version Published en_US
dc.author.school SOM en_US
dc.author.idnumber 201700518 en_US
dc.author.department N/A en_US
dc.description.embargo N/A en_US
dc.relation.journal American Journal of Neuroradiology en_US
dc.journal.volume 24 en_US
dc.journal.issue 4 en_US
dc.article.pages 567-578 en_US
dc.identifier.ctation Saatci, I., Cekirge, H. S., Ciceri, E. F., Mawad, M. E., Pamuk, A. G., & Besim, A. (2003). CT and MR imaging findings and their implications in the follow-up of patients with intracranial aneurysms treated with endosaccular occlusion with onyx. American journal of neuroradiology, 24(4), 567-578. en_US
dc.author.email michel.mawad@lau.edu.lb en_US
dc.identifier.tou http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php en_US
dc.identifier.url http://www.ajnr.org/content/24/4/567.short en_US
dc.author.affiliation Lebanese American University en_US


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