Abstract
IgG4-related disease (IgG4-RD) is a recently recognized systemic autoimmune disorder characterized by high levels of serum IgG4 and dense infiltration of IgG4-positive plasma cells in multiple organs. The condition was first described as a disease of the pancreas, and has since been recognized in various organ systems including the kidneys. IgG4 related kidney disease (IgG4-RKD) signifies any form of renal involvement by IgG4-RD. The most common renal involvement by IgG4-RD is tubulointerstitial nephritis. Glomerular disease, in particular membranous glomerulonephritis, may also be seen. Other co-existent glomerular diseases such as IgA nephropathy, membranoproliferative glomerulonephritis, and mesangioproliferative immune complex glomerulonephritis may be identified. IgG4-related plasma cell arteritis has also been noted in the kidney. As with IgG4-RD in general, IgG4 related kidney disease (IgG4-RKD) usually occurs in middle-aged to elderly men. Common findings in IgG4-RKD are plasma cell-rich interstitial inflammatory infiltrate either in a focal or diffuse pattern with increased IgG4+ plasma cells, expansile swirling interstitial fibrosis, high levels of serum IgG and IgG4, hypocomplementemia, high serum IgE levels and/or p...Continue Reading
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