Successful use of avacopan in a case of ANCA-associated vasculitis with treatment-resistant medium-sized vessel involvement. - Tsuchiya T; Ohta Y; Oka M; Fukushima K; Matsuno S; Yamanaka N; Suzuki N; Yumura W; Komatsu A; Arai T; Takei T; Itabashi M (CEN case reports, 2025)