Immunoglobin G4-related disease (IgG4-RD) is a rare fibro-inflammatory disease of unknown etiology that has been recently recognized. It can cause fibro-inflammatory masses in almost every organ of the body and is associated with dense lymphoplasmacytic infiltration of IgG4-postitive plasma cells, storiform fibrosis and elevated levels of serum IgG4.1 IgG4-RD is a systemic disease that may…
![IgG4-Related Kidney Disease: Diagnostics, Manifestations, & More](https://www.the-rheumatologist.org/wp-content/uploads/2018/05/THR_0518_pg1a_slider-150x150.png)