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The stepwise endovascular strategy appropriate for intracranial atherosclerotic stenosis-related large vessel occlusion. ICAS, intracranial atherosclerotic stenosis; LVO, large vessel occlusion; GRE-MR, gradient echo magnetic resonance imaging; HAS, hyperdense artery sign; NECT, non-enhanced computed tomography; TTO, truncal type occlusion; CT, computed tomography; SR, stent retriever; GPI, glycoprotein IIb/IIIa inhibitor.
