Xanthogranulomatous Pyelonephritis Presenting with a Left Flank Mass

Figure 2

CT abdomen/pelvis with IV contrast and delayed phase demonstrating a left kidney with parenchyma replaced with multiple large hypodense collections containing fluid and gas, a left staghorn calculus, and a communication between the kidney and large flank collection. Additionally, a 13.5 × 7.7 cm multiloculated pelvic mass was noted.