Xanthogranulomatous pyelonephritis in childhood.

Eleven children with xanthogranulomatous pyelonephritis are reported. The left side was affected in all patients. It is suggested that the diagnosis can be made pre-operatively. The condition is characterised by the fact that it is always unilateral and that renal calculi are found in a kidney with gross impairment of function; associated anaemia, leucocytosis and raised ESR are also present. The cause is unclear, but an obstructive element with infection is usually found.