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[Xanthogranulomatous pyelonephritis : bear paw sign].
Manon Partoune1, Denis Danthine1
1Service de radiodiagnostic, CHU de Liège, Belgique.
Revue Medicale De Liege
|September 12, 2024
Summary
The rare «bear paw sign» on imaging is a key indicator of xanthogranulomatous pyelonephritis. This condition often links to urinary tract obstructions and infections.
Area of Science:
- Nephrology
- Radiology
- Pathology
Background:
- Xanthogranulomatous pyelonephritis (XGP) is a rare, chronic kidney inflammation.
- It is frequently associated with obstructive uropathy, particularly staghorn calculi.
- Recurrent urinary tract infections are a common comorbidity.
Observation:
- The study highlights the pathognomonic «bear paw sign» in imaging.
- This specific radiographic appearance is characteristic of XGP.
- The sign aids in the diagnosis of this uncommon renal pathology.
Findings:
- The «bear paw sign» is a distinctive imaging finding for xanthogranulomatous pyelonephritis.
- Its presence strongly suggests this specific type of chronic pyelonephritis.
- The sign is linked to underlying obstructive causes and infection.
Implications:
- Early identification of the «bear paw sign» can lead to timely diagnosis of XGP.
- Improved diagnostic accuracy aids in appropriate patient management.
- Understanding this sign enhances the radiologic diagnosis of complex kidney conditions.
