Which imaging feature is often seen in Xanthogranulomatous Pyelonephritis?

Which imaging feature is often seen in Xanthogranulomatous Pyelonephritis?

• A. Renal atrophy
• B. Echogenic sinus
• C. Cyst formation
• D. Renal cortical thinning

Answer: (B)

In xanthogranulomatous pyelonephritis the collecting system is often obstructed by stones and filled with inflammatory debris, so ultrasound typically shows bright echoes within the renal sinus. These echogenic foci, often with posterior acoustic shadowing from calculi, create an echogenic renal sinus that stands out against the rest of the kidney. This feature reflects the combination of calcifications and inflammatory material in the collecting system, which is characteristic of XGP. The kidney may be enlarged and the parenchyma disrupted over time, with potential cortical thinning or loss of function, but the echogenic sinus due to calcifications and debris is the most distinctive ultrasound sign.

In xanthogranulomatous pyelonephritis the collecting system is often obstructed by stones and filled with inflammatory debris, so ultrasound typically shows bright echoes within the renal sinus. These echogenic foci, often with posterior acoustic shadowing from calculi, create an echogenic renal sinus that stands out against the rest of the kidney. This feature reflects the combination of calcifications and inflammatory material in the collecting system, which is characteristic of XGP. The kidney may be enlarged and the parenchyma disrupted over time, with potential cortical thinning or loss of function, but the echogenic sinus due to calcifications and debris is the most distinctive ultrasound sign.