Abstract
We encountered a 64-year-old Japanese woman who developed subarachnoid hemorrhaging (SAH) with multiple cerebral artery stenoses during remission induction therapy for eosinophilic granulomatosis and polyangiitis (EGPA). The treatment involved intensified steroid pulse therapy and continued intravenous cyclophosphamide pulse therapy, which led to beneficial effects. Given the rarity of multiple EGPA-associated cerebral artery stenoses and SAH, it is crucial to differentiate them from other diseases. The mortality rate of EGPA complicated by intracranial hemorrhagic lesions, including SAH, is high. When headache is present at the onset of EGPA, the possibility of SAH must be considered.
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