A 13-Month-Old With Xanthogranulomatous Pyelonephritis With Features of Renal Malakoplakia

Area of Science:

• Nephrology
• Pathology
• Pediatric Nephrology

Background:

• Xanthogranulomatous pyelonephritis (XGP) is a rare chronic inflammatory kidney disease characterized by parenchymal destruction and foamy macrophages.
• Renal malakoplakia is another rare granulomatous disease, typically seen in immunocompromised adults, marked by Michaelis-Gutmann bodies.

Purpose of the Study:

• To present a pediatric case initially suspected as XGP.
• To demonstrate the co-existence of XGP and renal malakoplakia in a single patient.
• To suggest these conditions may lie on a disease spectrum.

Main Methods:

• Case report of a 13-month-old male with congenital hydronephrosis.
• Clinical and radiological evaluation.
• Pathological examination revealing Michaelis-Gutmann bodies.

Main Results:

• Clinical and radiological findings were suggestive of xanthogranulomatous pyelonephritis.
• Pathological analysis confirmed the presence of Michaelis-Gutmann bodies, pathognomonic for renal malakoplakia.
• The case demonstrated overlapping features of both conditions.

Conclusions:

• Xanthogranulomatous pyelonephritis and renal malakoplakia are not necessarily mutually exclusive.
• These rare renal inflammatory conditions may represent different manifestations within a single disease spectrum.
• Further evidence supports a unified understanding of these pathologies.