There are a number of important mimics of IgG4-RD that should be considered 🔵ANCA-associated vasculitis 🔵Multicentric Castleman’s disease 🔵Rosai-Dorfman disease 🔵Inflammatory myofibroblastic tumour 🔵Cutaneous plasmacytosis 🔵Erdheim-Chester disease 🔵Malignancy #ACR20