Bony affair–a rare case of osseous metaplasia in a native nonfunctioning kidney

Abstract

Renal osseous metaplasia is a rare condition in a native kidney with end-stage renal disease, which presents mature bone with marrow elements in the background of chronic pyelonephritis. Osseous metaplasia has been reported in allograft specimens; however, the incidence thereof is extremely rare in a native kidney. Although the pathogenesis thereof is unknown, chronic ischemia and inflammation may be triggering factors. Osseous metaplasia has been previously reported in renal allograft specimens, but in this case report, we present a rare histological finding of osseous metaplasia in a native kidney.