Xanthogranulomatous pyelonephritis in children

Area of Science:

• Pediatric Nephrology
• Renal Pathology
• Infectious Diseases

Background:

• Xanthogranulomatous pyelonephritis (XGP) is typically seen in adult women and presents as a renal mass.
• An increasing number of pediatric XGP cases suggest different disease characteristics compared to adults.
• The distinction between XGP and chronic pyelonephritis in children requires further investigation.

Purpose of the Study:

• To determine if XGP in children is a distinct entity from chronic pyelonephritis.
• To compare pediatric XGP cases with adult XGP and pediatric chronic pyelonephritis.

Main Methods:

• Retrospective review of 39 pediatric cases undergoing nephrectomy for chronic or xanthogranulomatous pyelonephritis.
• Comparison of pediatric XGP cases with literature data on adult XGP and local pediatric chronic pyelonephritis cases.
• Analysis of clinical presentation, demographic data, and microbiological findings.

Main Results:

• Demographics and left kidney involvement were similar between pediatric XGP and chronic pyelonephritis groups.
• Severe malnutrition, urolithiasis, reno-cutaneous fistula, and negative urine cultures were more frequent in pediatric XGP.
• Escherichia coli was the most common microorganism in both groups; all pediatric XGP cases were diffuse.

Conclusions:

• Pediatric XGP may not be as distinct from chronic pyelonephritis as in adults.
• Impaired immune response secondary to malnutrition and the presence of urolithiasis may contribute to XGP development in children.
• Further research is needed to elucidate the specific pathogenesis of XGP in the pediatric population.