We report the case of a 68-year-old man who suddenly developed right hemiparesis. MRI of the brain revealed a new infarction in the left corona radiata, and intravenous rt-PA was administered 100 minutes after the onset of symptoms. After the rt-PA infusion was started, his consciousness declined and the CT revealed bilateral intracerebral hemorrhage. His consciousness did not improve thereafter. He was diagnosed with ANCA-associated vasculitis owing to the high levels of MPO-ANCA and urinary protein and the presence of erythrocytes without any other cause of renal damage. Although ANCA-associated vasculitis rarely involves the central nervous system, intracerebral hemorrhage as well as cerebral infarction may occur. This case provides an important opportunity to explore the implications of intravenous rt-PA therapy for acute cerebral infarction in patients with ANCA-associated vasculitis.
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