Clinical and pathological features of patients with antineutrophil cytoplasmic antibody‐associated vasculitides concomitant with IgG4‐related disease

Aim The characteristics and the pathogenesis of the concomitant antineutrophil cytoplasmic antibody (ANCA)‐associated vasculitides (AAV) and immunoglobulin G4‐related disease (IgG4‐RD) have not been elucidated. Method We included 92 AAV patients with renal biopsy results. Among them, 10 patients met both AAV and IgG4‐RD criteria (concomitant group). The IgG subclasses of myeloperoxidase (MPO)‐ANCA in both serum and renal tissue were measured and...