FOCAL XANTHOGRANULOMATOUS PYELONEPHRITIS IN A YOUNG-CHILD

An 18-month-old female child presented with fever and an abdominal mas s, which, after ultrasonography, computed tomography, and magnetic res onance imaging was considered to be an atypical cystic renal neoplasm. Nephrectomy was performed. Histopathological examination demonstrated the mass to be focal xanthogranulomatous pyelonephritis. This lesion should be considered in the differential diagnosis of renal neoplasms in childhood, particularly cystic Wilms' tumor or Wilms' tumor with si gnificant intratumoral hemorrage.