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. 2023 Jul 3;14:122. doi: 10.1007/s12672-023-00741-z

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Fig. 2 — Finding of PRFS on the excretory phase of CT. The PRFS is graded according to its degree. a No PRFS. b Mild PRFS. c Moderate PRFS. d Severe PRFS. No and mild PRFS are defined as low PRFS. Moderate and severe PRFS are defined as high PRFS. PRFS perirenal fat stranding