Xanthogranulomatous pyelonephritis presenting with a left flank mass
Related Experiment Video
Updated: May 4, 2026

Author Spotlight: Developing a Bedside Protocol for Kidney and Genitourinary Ultrasonography
Published on: June 21, 2024
Uwais B Zaid1, Sima P Porten1, Nadya M Cinman1
1Department of Urology, University of California San Francisco, 400 Parnassus Avenue, San Francisco, CA 94143, USA.
Abstract:
We present a case of a patient with xanthogranulomatous pyelonephritis (XGP) presenting with a large (18 × 12 cm) left-sided flank mass with worsening left flank pain. CT abdomen/pelvis demonstrated a left kidney with parenchyma replaced by multiple large hypodense collections containing fluid and gas, a left staghorn calculus, and a communication between the kidney and large flank collection. About 4.5 weeks after initial presentation, the patient underwent operative intervention. Pathology revealed an end-stage kidney with scar consistent with xanthogranulomatous pyelonephritis.
Related Concept Videos
Acute Pyelonephritis I: Introduction
Acute Pyelonephritis II: Diagnostic Studies and Management
Nursing Assessment of the Genitourinary System II: Inspection and Palpation
Pulmonary Tuberculosis III
The first classification is based on the development of the disease, and it includes the following categories:
Appendicitis-I: Introduction
Etiology: Appendicitis can arise from various causes, primarily rooted in the obstruction of the appendix lumen. Factors contributing to this obstruction include fecal accumulation, lymphoid hyperplasia and, in...
Urinary Tract Calculi II: Pathophysiology and Clinical Manifestations
