The CT features of Xanthogranulomatous pyelonephritis(XGP)include multiple,rounded,low density areas with enhancing rings arranged in a hydronephrotic pattern known as bear paw sign.

• 黄色肉芽肿性肾盂肾炎(XGP)的特征是CT示群集的类圆形的低密度区以及环形增强带形成“熊掌征”；