IL33 and autoimmune pancreatitis: Previous research has demonstrated that plasmacytoid dendritic cells (pDCs) that produce IFN‐alpha and IL‐33 play a proinflammatory and pathogenic role in Autoimmune Pancreatitis (AIP) and IgG4‐related diseases.[20] Additionally, M2 macrophages expressing IL‐33 have been implicated in the pathogenesis of IgG4‐related disease.[21, 22] We next would like to identify whether pDCs or M2 macrophages are activated.