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Lesions detected by DWI were categorized as follows: A) 1\u20133 DWI spots < 10 mm, B) > 3 DWI spots < 10 mm, C) single DWI lesion > 10 mm, or D) DWI lesion related to surgical access.<\/jats:p><\/jats:sec>\n\nRESULTS<\/jats:title>\nBetween 2010 and 2014, 99 cases were included. Sixty-two UIA were treated by MC and 37 by EC. There were no significant differences between groups in age, sex, aneurysm size, occurrence of multiple aneurysms in 1 patient, or presence of lesions detected by DWI before treatment. Aneurysms treated by EC were significantly more often located in the posterior circulation (p < 0.001). Diffusion-weighted MRI detected new lesions in 27 (43.5%) and 20 (54.1%) patients after MC and EC, respectively (not significant). The pattern of lesions detected by DWI varied significantly between groups (p < 0.001). Microembolic lesions (A and B) found on DWI were detected more frequently after EC (A, 14 cases; B, 5 cases) than after MC (A, 5 cases), whereas C and D were rare after EC (C, 1 case) and occurred more often after MC (C, 12 cases and D, 10 cases). No procedure-related unfavorable outcomes were detected.<\/jats:p><\/jats:sec>\n\nCONCLUSIONS<\/jats:title>\nAccording to the specific techniques, lesion patterns differ between MC and EC, whereas the frequency of new lesions found on DWI is similar after occlusion of UIA. In general, the lesion load was low in both groups, and lesions were clinically silent.<\/jats:p>\nClinical trial registration no.: NCT01490463 (clinicaltrials.gov<\/jats:ext-link>)<\/jats:p><\/jats:sec>","DOI":"10.3171\/2016.2.jns152456","type":"journal-article","created":{"date-parts":[[2016,5,21]],"date-time":"2016-05-21T23:01:04Z","timestamp":1463871664000},"page":"1070-1078","source":"Crossref","is-referenced-by-count":26,"title":["Early diffusion-weighted MRI lesions after treatment of unruptured intracranial aneurysms: a prospective study"],"prefix":"10.3171","volume":"126","author":[{"given":"Johannes","family":"Platz","sequence":"first","affiliation":[{"name":"Departments of Neurosurgery and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marlies","family":"Wagner","sequence":"additional","affiliation":[{"name":"Neuroradiology, University Hospital Frankfurt, Goethe-University, Frankfurt, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Erdem","family":"G\u00fcresir","sequence":"additional","affiliation":[{"name":"Departments of Neurosurgery and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Se-Jong","family":"You","sequence":"additional","affiliation":[{"name":"Neuroradiology, University Hospital Frankfurt, Goethe-University, Frankfurt, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juergen","family":"Konczalla","sequence":"additional","affiliation":[{"name":"Departments of Neurosurgery and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard du Mesnil","family":"de Rochemont","sequence":"additional","affiliation":[{"name":"Neuroradiology, University Hospital Frankfurt, Goethe-University, Frankfurt, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joachim","family":"Berkefeld","sequence":"additional","affiliation":[{"name":"Neuroradiology, University Hospital Frankfurt, Goethe-University, Frankfurt, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Volker","family":"Seifert","sequence":"additional","affiliation":[{"name":"Departments of Neurosurgery and"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1754","reference":[{"key":"b1-jns152456","series-title":"J Neurointerv Surg","doi-asserted-by":"publisher","first-page":"147","DOI":"10.1136\/jnis.2010.003616","article-title":"Thromboembolic events associated with endovascular treatment of cerebral aneurysms","volume":"3","author":"Altay T,","year":"2011","unstructured":"Altay T, Kang HI, Woo HH, Masaryk TJ, Rasmussen PA, Fiorella DJ, : Thromboembolic events associated with endovascular treatment of cerebral aneurysms. 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