Xanthogranulomatous pyelonephritis

Discussion:

CT scan demonstrates an enlarged right kidney with a large pelvic staghorn calculus and chronic grade III hydronephrosis with perirenal fatty proliferation.

The appearance is characteristic of xanthogranulomatous pyelonephritis. Also note the formation of a perirenal abscess that extends to involve the right psoas muscle and subhepatic region.

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