is generally agreed that EGPA is an anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV), which is positive for ANCA in approximately 50-70% of cases (2,3), especially in patients with glomerulonephritis (4). The time from disease activity to diagnosis was shorter in ANCA positive patients than in ANCA negative patients, and the inflammatory response was more severe. EGPA