Sonographic features of xanthogranulomatous pyelonephritis

Area of Science:

• Nephrology
• Radiology
• Pathology

Background:

• Xanthogranulomatous pyelonephritis (XGP) is a rare, chronic bacterial infection of the kidney.
• Accurate diagnosis is crucial for appropriate management and preventing complications.

Observation:

• Presents ultrasonic findings in three surgically confirmed cases of XGP.
• Describes characteristic renal morphology observed during ultrasound examinations.

Findings:

• Consistently observed features include markedly enlarged kidneys with a large central echogenic area.
• An increased parenchymal anechoic pattern was noted, correlating with radiographic and gross pathology.
• Distinctive ultrasonic appearance, though potential confusion with hydronephrosis, particularly with staghorn calculus, is anticipated.

Implications:

• Highlights the diagnostic utility of ultrasound in identifying XGP.
• Suggests potential diagnostic challenges in differentiating XGP from hydronephrosis.
• Underscores the need for careful interpretation, especially in complex cases with co-existing conditions.