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  Indian J Med Microbiol
 

Figure 1: (a) Low power view of tubulointerstitial nephritis with dense lymphoplasmacytic infiltrate (H and E, ×100). (b) Plasma cell-rich interstitial infiltrate associated with extensive fibrosis (H and E, ×400). (c) Immunostaining for immunoglobulin G4 shows >25 immunoglobulin G4-positive plasma cells in single high-power field (IHC, ×400)

Figure 1: (a) Low power view of tubulointerstitial nephritis with dense lymphoplasmacytic infiltrate (H and E, ×100). (b) Plasma cell-rich interstitial infiltrate associated with extensive fibrosis (H and E, ×400). (c) Immunostaining for immunoglobulin G4 shows >25 immunoglobulin G4-positive plasma cells in single high-power field (IHC, ×400)