Clinicopathological findings of immunoglobulin G4-related kidney disease

Immunoglobulin (Ig) G4-related kidney disease characterizing tubulointerstitial nephritis (TIN) is an organ complication recognized in IgG4-related systemic diseases that has some unique aspects compared to other types of TIN. TIN lesions in the kidney can be tumor-like, focal or diffuse. Abnormal urinalysis is usually mild or absent even in the cases with deteriorated renal dysfunction. Some cases are accidentally diagnosed from radiological...