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Case Reports in Medicine
Volume 2013, Article ID 362194, 3 pages
Case Report

Xanthogranulomatous Pyelonephritis Presenting with a Left Flank Mass

Department of Urology, University of California San Francisco, 400 Parnassus Avenue, San Francisco, CA 94143, USA

Received 5 September 2013; Revised 27 October 2013; Accepted 28 October 2013

Academic Editor: Chin-Jung Wang

Copyright © 2013 Uwais B. Zaid et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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.