Xanthogranulomatous Pyelonephritis in a Neonate Masquerading as Renal Mass.

Xanthogranulomatous pyelonephritis (XGP), a variant of chronic obstructive pyelonephritis, is a very rare diagnosis in neonates with three reported cases to date. It is often misdiagnosed in infancy as it mimics the features of renal mass. Herein, we report a case of 20-day-old neonate with XGP presenting as a renal mass.