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Fig. 9. 51-year-old woman with xanthogranulomatous pyelonephritis and
history of staghorn calculus and chronic urinary tract infection. Axial late
arterial phase contrast-enhanced CT image shows enlarged right kidney with
abscesslike low-density cavity (asterisk) in renal hilum. Staghorn
calculus is noted (arrowheads) and was also seen on unenhanced images
(not shown). Perirenal space extension of inflammatory process
(arrow) also is visible.