This book offers a detailed review of the pathological and imaging features, diagnosis and treatment of IgG4-Related Kidney Disease (IgG4RKD). IgG4-related disease (IgG4RD), which is characterized by an elevated serum IgG4 level and infiltration of systemic organs by IgG4 positive plasma cells, is a newly recognized systemic disease. Diverse renal manifestations including specific tubulointerstitial nephritis, membranous nephropathy, and tumor-like urological diseases extending to the pelvis and urinary tract in IgG4RD have been reported and are recently attracting attention as IgG4RKD. In this book, leading researchers in the field present the latest insights into the broad spectrum of IgG4-RKD characteristics. In addition, they provide a detailed explanation of the pathology of IgG4-RKD including comparisons between the kidney and other affected organs, such as the lacrimal, salivary glands and pancreas in the histopathological section. IgG4-Related Kidney Disease will have a major impact on future immunological and nephrological studies and offers a useful resource not only for nephrologists but also general physicians and investigators in related fields.