Renal replacement lipomatosis and xanthogranulomatous pyelonephritis: A rare coexistence

Abstract

Xanthogranulomatous pyelonephritis (XGP) is a granulomatous inflammation caused by chronic infection. Renal replacement lipomatosis represents a condition in which there is extensive proliferation of fat within the perirenal space and renal sinus, replacing the renal parenchyma. Coexistence of XGP and replacement lipomatosis in the same kidney is a very rare phenomenon. We report a rare such case with gross, histopathological and immunohistochemical findings in a 61-year-old male patient who presented with gross haematuria and right flank pain.