Immunoglobulin G4-related kidney disease involving the renal pelvis and perirenal fat: A case report

Figure 1 Abdominal computed tomography scan and magnetic resonance imaging scan. A: The scan shows diffuse bilateral enlargement of the kidneys and perirenal fat and thickening of the renal pelvic walls; B: Contrast-enhancement shows thickening of the wall of the renal pelvis.

Figure 2 Histopathology of the lymph node. A: The section shows dense lymphoplasmacytic cells with fibrotic changes (H&E 400×); B: Immunohistochemical staining shows an average of 100 IgG4-positive plasma cells per high-power field.