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Clinicopathological features of xanthogranulomatous pyelonephritis in infancy
W K Clapton1, H A Boucaut, P A Dewan
1Department of Histopathology, Adelaide Children's Hospital.
Insights
Xanthogranulomatous pyelonephritis (XGP) is a rare inflammatory kidney disease, often seen in middle-aged women. This study suggests a link between XGP and early-life infections or urinary issues.
Area of Science:
- Nephrology
- Pathology
- Pediatric Urology
Background:
- Xanthogranulomatous pyelonephritis (XGP) is an uncommon chronic inflammatory kidney disease.
- It predominantly affects middle-aged women but is rare in infants.
- Predisposing factors include infection, calculi, and obstructive uropathy.
Observation:
- A review of 4 nephrectomy cases (1964-1991) revealed typical XGP features.
- Renal parenchyma was effaced by inflammatory infiltrate, including foamy histiocytes.
- Michaelis-Gutmann bodies were notably absent in the specimens.
Findings:
- The study identified associations between XGP and chronic infection, anatomical malformations, and reflux in infancy.
- Histological examination showed a mixed acute and chronic inflammatory infiltrate with foamy histiocytes.
Implications:
- These findings suggest a potential role for altered immune responses in the pathogenesis of XGP.
- Understanding these associations may improve diagnosis and management of pediatric kidney conditions.
Abstract:
Xanthogranulomatous pyelonephritis (XGP) is an unusual chronic inflammatory condition which most often affects women in their 5th to 7th decades and is rare in infants. Predisposing factors include infection, calculi and obstructive uropathy. We have reviewed the surgical files of 4 cases seen over a 28 yr period from 1964-91. All of the 3 partial and one total nephrectomy specimens demonstrated typical features of XGP with renal parenchyma effaced by a mixed acute and chronic inflammatory infiltrate which included prominent aggregates of foamy histiocytes containing eosinophilic inclusions. No Michaelis-Gutmann bodies were seen. This study shows the association of XGP with chronic infection, anatomical malformation and reflux in infancy, and raises the possibility of a temporary altered immune response in its pathogenesis.