• Simon Chun-Ho Yu, Ching-Kwong Kwok, Pui-Wai Cheng, Kwong-Yau Chan, Samuel Shun Lau, Wai-Man Lui, Ka-Ming Leung, Raymand Lee, Harold Kin-Ming Cheng, Yuk-Ling Cheung, Chi-Ming Chan, George Kwok-Chu Wong, Joyce Wai-Yi Hui, Yiu-Chung Wong, Chong-Boon Tan, Wai-Lun Poon, Kai-Yuen Pang, Alain Kai-Sing Wong, and Kai-Hung Fung.
• Department of Imaging and Interventional Radiology and Division of Neurosurgery, Department of Surgery, the Chinese University of Hong Kong, Prince of Wales Hospital, 30-32 Ngan Shing Street, Room 2A061, 2/F, New Extension Block, Shatin, New Territories, Hong Kong. simonyu@cuhk.edu.hk
• Radiology. 2012 Dec 1; 265 (3): 893-901.

PurposeTo evaluate the midterm clinical and angiographic outcomes after pipeline embolization device (PED) placement for treatment of intracranial aneurysms.Materials And MethodsThis prospective nonrandomized multicenter study was approved by the review boards of all involved centers; informed consent was obtained. Patients (143 patients, 178 aneurysms) with unruptured saccular or fusiform aneurysms or recurrent aneurysms after previous treatment were included and observed angiographically for up to 18 months and clinically for up to 3 years. Study endpoints included complete aneurysm occlusion; neurologic complications within 30 days and up to 3 years; clinical outcome of cranial nerve palsy after PED placement; angiographic evidence of occlusion or stenosis of parent artery and that of occlusion of covered side branches at 6, 12, and 18 months; and clinical and computed tomographic evidence of perforator infarction.ResultsThere were five (3.5%) cases of periprocedural death or major stroke (modified Rankin Scale [mRS] > 3) (95% confidence interval [CI]: 1.3%, 8.4%), including two posttreatment delayed ruptures, two intracerebral hemorrhages, and one thromboembolism. Five (3.5%) patients had minor neurologic complications within 30 days (mRS = 1) (95% CI: 1.3%, 8.4%), including transient ischemic attack (n = 2), small cerebral infarction (n = 2), and cranial nerve palsy (n = 1). Beyond 30 days, there was one fatal intracerebral hemorrhage and one transient ischemic attack. Ten of 13 patients (95% CI: 46%, 93.8%) completely recovered from symptoms of cranial nerve palsy within a median of 3.5 months. Angiographic results at 18 months revealed a complete aneurysm occlusion rate of 84% (49 of 58; 95% CI: 72.1%, 92.2%), with no cases of parent artery occlusion, parent artery stenosis (<50%) in three patients, and occlusion of a covered side branch in two cases (posterior communicating arteries). Perforator infarction did not occur.ConclusionPED placement is a reasonably safe and effective treatment for intracranial aneurysms. The treatment is promising for aneurysms of unfavorable morphologic features, such as wide neck, large size, fusiform morphology, incorporation of side branches, and posttreatment recanalization, and should be considered a first choice for treating unruptured aneurysms and recurrent aneurysms after previous treatments.Supplemental Materialhttp://radiology.rsna.org/lookup/suppl/doi:10.1148/radiol.12120422/-/DC1.© RSNA, 2012.

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