Bear’s paw sign -refers to a distinctive cross-sectional…

Bear’s paw sign -refers to a distinctive cross-sectional imaging appearance of the kidney in xanthogranulomatous pyelonephritis.  In this chronic granulomatous disease the kidney is progressively replaced by a mass of reactive tissue appearing like the pads of a bear’s paw. The disease is almost always incited by staghorn calculi as was the case for this patient.

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