Fig. 3From: IgG4-related kidney disease from the renal pelvis that mimicked urothelial carcinoma: a case reportPathologic examination of the renal sections. (a). Numerous lymphoid follicles and prominent fibrosis beneath the urothelial epithelium of the renal pelvis; (b). Numerous plasma cells and scattered eosinophils were identified in the interfollicular area. Immunohistochemistry showed numerous IgG+ (c) and IgG4+ (d) plasma cellsBack to article page