Figure 3.
AIN pattern of IgG4-TIN. Plasma cell-rich interstitial inflammation with minimal fibrosis and no tubular atrophy (left panel). Immunoperoxidase staining for IgG4 (right panel) shows a marked increase in IgG4+ plasma cells. This pattern of injury shows minimal or no TBM immune deposits. (Hematoxylin and eosin).