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Bear's paw sign

Dr Ian Bickle and Dr Frank Gaillard et al.

The bear's paw sign is seen in xanthogranulomatous pyelonephritis and refers to the cross-sectional appearance of the kidney which is said to resemble the paw of a bear. The renal pelvis is contracted whereas the calyces are dilated, mimicking the toe-pads of the paw.

References

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1. Dyer RB, Chen MY, Zagoria RJ. Classic signs in uroradiology. Radiographics. 2004;24 Suppl 1 (suppl 1): S247-80. doi:10.1148/rg.24si045509 - Pubmed citation

Synonyms & Alternative Spellings

Synonyms or Alternative Spelling	Include in Listings?
Bear's paw sign of XPN	✗
Bear's paw sign in XPN	✗
Bear's paw sign of xanthogranulomatous pyelonephritis	✗
Bear's paw sign in xanthogranulomatous pyelonephritis	✗