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Figure 1: (a) Computed tomography picture showing the right renal pelvic mass. (b) Gross specimen showing a yellowish-white tumorinvolving the pelvicalyceal system (PCS). (c) Microscopic image from the kidney section shows storiform fibrosis along with dense lymphoplasmacytic infiltrate (H and E, 200). (d) Immunohistochemistry showing immunoglobulin G4-positive plasma cells (>30 per high-power field)

Figure 1: (a) Computed tomography picture showing the right renal pelvic mass. (b) Gross specimen showing a yellowish-white tumorinvolving the pelvicalyceal system (PCS). (c) Microscopic image from the kidney section shows storiform fibrosis along with dense lymphoplasmacytic infiltrate (H and E, 200). (d) Immunohistochemistry showing immunoglobulin G4-positive plasma cells (>30 per high-power field)