Pyelonephritis other imaging findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Other Imaging Findings

Contrast Nephrograms

Acute Pyelonephritis

• Acute pyelonephritis consists of focal areas of striated or wedge-shaped hypoperfusion, resulting in a characteristic striated nephrogram.
• Striations result from stasis of contrast material within edematous tubules that demonstrates increasing attenuation over time.
• The infected kidney is usually enlarged, and there is often stranding in the perinephric fat.
• Delayed views of the infected kidney may demonstrate a nephrogram with increased attenuation.

Intravenous Pyelography

Intravenous Pyelography (IVP) is done to diagnose an intra-renal or peri-nephric abscesses. IVP is a very sensitive radiological test for this purpose.

Urography

Xanthogranulomatous Pyelonephritis

• Classic urographic triad in diffuse xanthogranulomatous pyelonephritis consists of unilaterally decreased or (more commonly) absent renal excretion, a staghorn calculus, and a poorly defined mass or diffuse renal enlargement.