Related Experiment Video
Updated: Dec 12, 2025

Intrarenal Injection of Escherichia coli in a Rat Model of Pyelonephritis
Published on: July 18, 2017
Imaging of Renal Infections and Inflammatory Disease
Maria Zulfiqar1, Cristián Varela Ubilla2, Refky Nicola3
1Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 South Kingshighway Boulevard, St Louis, MO 63110, USA.
Abstract:
Acute pyelonephritis is a bacterial infection of the renal parenchyma and collecting system. Diagnosis is based on clinical findings of fever, flank pain, and urinary tract infection. Computed tomography findings include renal enlargement with wedge-shaped heterogeneous areas of decreased enhancement, known as a "striated nephrogram." Imaging is primarily used to diagnose complications such as emphysematous pyelonephritis, renal abscess, and pyonephrosis. Chronic pyelonephritis can have varying appearances on imaging ranging from xanthogranulomatous pyelonephritis or, in extreme cases, renal replacement lipomatosis.
Related Concept Videos
Imaging Studies V: Intravenous Urography and Retrograde Pyelography
Imaging Studies II: Ultrasonography
Imaging Studies VII: Vascular Imaging
Imaging Studies III: Computed Tomography
Imaging Studies I: Kidney, Ureter, and Bladder Studies
Imaging Studies IV: Magnetic Resonance Imaging

