xanthogranulomatous pyelonephritis


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  • Clinical

    • staghorn calculi (70%)
    • sequela of obstructive pyelonephritis
    • microbiology: proteus, E. coli

  • Histology

    • central zone PMNs
    • rim of foamy macrophages and fibroblasts

  • Stains

    • CD68 stains xanthoma
    • CK negative
    		•