Clinicopathological differential diagnosis of IgG4‐related disease: A historical overview and a proposal of the criteria for excluding mimickers of IgG4‐related disease

IgG4‐related disease (RD) is a relatively new entity, which was first proposed in 2001. Since then, clinical and pathological characteristics of the disease have been investigated. As IgG4‐RD has been studied extensively, the diagnostic criteria for IgG4‐RD of each organ and the comprehensive diagnostic criteria for IgG4‐RD have also been developed. However, one of the biggest challenges in the field is distinguishing between IgG4‐RD and...