• Farhan Siddiq, Saqib A Chaudhry, Paramita Das, Rakesh Khatri, Gustavo Rodriguez, and Adnan I Qureshi.
• Zeenat Qureshi Stroke Research Center, University of Minnesota - Neurology, Minneapolis, MN, USA.
• J Neuroimaging. 2013 Jul 1;23(3):384-90.

BackgroundAcute stroke from intracranial internal carotid artery (ICA) occlusion can occasionally resemble angiographic cervical ICA dissection which may cause delays in endovascular acute ischemic stroke treatment.ObjectiveTo determine the angiographic characteristics of the phenomenon of "pseudodissection" and its clinical implications in acute ischemic stroke endovascular treatment.Material And MethodsRetrospective analysis of angiographic and clinical data from 31 patients with ischemic acute stroke secondary to intracranial ICA occlusion, treated with endovascular therapy at two University-affiliated institutions, was performed. Pseudodissection was defined as angiographic appearance of typical cervical ICA dissection with evidence of normal inner vascular wall upon further catheter exploration.ResultsAngiographic appearance pseudodissection was identified in 7 out of 31 patients (22.6%). Six patients had guide catheters placed proximal to pseudodissection in anticipation of stent placement for treatment of ICA dissection. All 7 patients had further exploration of the presumed dissected segment (6 microcatheter, 1 diagnostic catheter) which demonstrated normal vascular inner wall. The clot was located more commonly in the petro-cavernous segment in the pseudodissection patients (5/7, 71%). Carotid terminus clot was more common in ICA occlusion patients than pseudodissection patients (18/24, 75% vs. 2/7, 29% respectively, P < .0001). Recanalization was less common in pseudodissection patients compared to ICA occlusion patients (3/7 and 21/24 respectively, P = .029).ConclusionEarly recognition of pseudodissection in the ICA is important in the setting of acute ischemic stroke to avoid delay in treatment of intracranial ICA occlusion.Copyright © 2012 by the American Society of Neuroimaging.

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