INTRAPELVIC WILMS-TUMOR SIMULATING XANTHOGRANULOMATOUS PYELONEPHRITIS

A 2-year-old boy presented with an atypical renal mass with extension into the pyelocalyceal system and distal ureter which was diagnosed in itially as xanthogranulomatous pyelonephritis (XGP). The final diagnos is was intrapelvic Wilms' tumor extending into the ureter. In the lite rature, only three patients have been described with Wilms' tumor exte nding into the ureter, none of whom had a continuous extension into th e distal ureter.