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Magnetic resonance imaging (MRI) and MR angiography (MRA) findings. (A, B) MRI/diffusion-weighted imaging (DWI) at the time of initial presentation shows no acute cerebral infarction, but MRA reveals complete occlusion of the right internal carotid artery (ICA). (C) After intravenous injection of recombinant tissue plasminogen activator (rt-PA), cervical MRA demonstrates that the right ICA is still occluded.
