 | This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources. Find sources: "Bear paw sign" – news · newspapers · books · scholar · JSTOR (November 2024) |
The bear paw sign is a radiologic sign that describes the appearance of xanthogranulomatous pyelonephritis on computer tomography (CT) scans. Xanthogranulomatous pyelonephritis is a rare type of chronic pyelonephritis where the damaged areas of the kidneys are replaced by foam cells. On CT, multiloculated hypoattenuating masses with bright rim enhancement may be seen in the renal parenchyma, resembling the toe pads of a bear's paw. These masses are indicative of dilated renal calyces and xanthomas.
References
- Garrido-Abad, Pablo; Rodriguez-Cabello, Miguel Angel; Vera-Beron, Roberto; Platas-Sancho, Arturo (2018). "Bear Paw Sign: Xanthogranulomatous Pyelonephritis". Journal of Radiology Case Reports. 12 (11): 18–24. doi:10.3941/jrcr.v12i11.3415. ISSN 1943-0922. PMC 6312122. PMID 30647833.