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CT of the abdomen demonstrates abnormal right sided perinephric fluid collections associated with abnormal thickening of the anterior and posterior perirenal fascia as well as the bridging septa within the space. Extensive involvement of the perinephric space with gas densities. The presence of gas is the key finding of perinephric infection. Note also the accentuated left renal fascial planes. There is also a right renal stone.