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Open Access Publications from the University of California

Xanthogranulomatous pyelonephritis presenting with a left flank mass.

  • Author(s): Zaid, Uwais B
  • Porten, Sima P
  • Cinman, Nadya M
  • Sanford, Thomas H
  • Breyer, Benjamin N
  • et al.

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.

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