Xanthogranulomatous pyelonephritis

Case contributed by A.Prof Frank Gaillard

Presentation

Upper abdominal discomfort, vague constitutional symptoms and reduced renal function.

Patient Data

Age: Elderly
Gender: Female
X-ray

Abdominal x-ray

X-ray demonstrates a large right sided branched calculus which appears fragmented. 

CT demonstrates enlargement of the right kidney with multiple large renal calculi and rounded low density regions associated with the calculus. The left kidney is markedly atrophic.

Diagram

Single image from the CT with the right kidney outlined. Note how the dilated low density calyces form an appearance which has been likened to that of the pads of a bear paw. 

MRI

MRI abdomen

.

Case Discussion

Features are consistent with xanthogranulomatous pyelonephritis and pre-existing staghorn calculus.

Case courtesy of Dr Laura Jimenez Juan (CT) and Dr Natalie Yang (MRI)

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Case information

rID: 9931
Case created: 1st Jun 2010
Last edited: 16th Nov 2016
System: Urogenital
Inclusion in quiz mode: Included

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