Images in Clinical UrologyBear's Paw Sign: A Classic Presentation of Xanthogranulomatous Pyelonephritis
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A pediatric case of xanthogranulomatous pyelonephritis in the setting of Covid-19 and multi-system inflammatory syndrome (MIS-C)
2022, Journal of Pediatric Surgery Case ReportsCitation Excerpt :In the focal form, a localized intrarenal mass with fluid-like attenuation may be seen [28]. The most commonly described radiologic appearance is the “bear paw” sign, which is due to the presence of multiple, hypoechoic areas of the dilated collecting system with pus and debris that is surrounded by an enhanced rim of contrast medium [28,43,44]. An important distinction to note is the difference between “bear paw” sign seen in XGP and the “claw” sign which has been described in Wilms tumor and refers to a normal rim of renal parenchyma surrounding an inner renal mass [45].
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