%0 Journal Article
%T El signo de la "pata de oso" En TC
%A Bernstein B
%A Tom¨¢s
%A Cabrera T
%A Roberto
%A Barbieri H
%A Marco
%A Soffia S
%A Pablo
%J Revista chilena de radiolog¨ªa
%D 2011
%I Scientific Electronic Library Online
%R 10.4067/S0717-93082011000100008
%X the "bear paw sign" is an unusual radiologic finding indicating xantogranulomatous pyelonephritis (xgp). it refers to the replacement of the renal parenchyma by necrotic areas or xanthomatous collections with a pattern mimicking hydronephrotic calyx dilatation, associated with peripheral enhancing of the renal cortex after intravenous contrast administration. this sign can be observed on computed tomography (ct) scannings, where the cross-sectional appearance of the kidney resembles the paw of a bear and necrotic areas mimic the toe-pads of the paw. depending on the presentation of the disease (i.e., focal or diffuse), a differential diagnosis considering tumor-like renal cell carcinomas or fibrolipomatous replacement of the kidney has to be performed. a proper recognition of the "bear paw sign" on ct scans enables the radiologist to establish the diagnosis of xgp.
%K kidney diseases
%K pyelonephritis
%K xanthogranulomatous pyelonephritis.
%U http://www.scielo.cl/scielo.php?script=sci_abstract&pid=S0717-93082011000100008&lng=en&nrm=iso&tlng=en