PLA2R1 and membranous glomerulonephritis: The tissue showed diffuse active, subacute, and moderate to severe chronic interstitial inflammation, with dominant IgG4 positive, plasma cell-rich, diagnostic of IgG4-related TIN along with a secondary form of membranous glomerulonephritis with IgG4 dominant deposits that are negative for phospholipase A2 receptor (PLA2R), neural epidermal growth factor-like 1 (NELL1), thrombospondin 7A and exostosin I&II using immunohistochemical techniques.