Справа наблюдается легкий паранефрит.

Stranding of perinephric fat is defined as linear areas of soft tissue attenuation in the perinephric space, which can result from any acute process or injury to the kidney. When unilateral perinephric stranding is identified it is most frequently the result of calyceal rupture or perinephric inflammation. Perinephric stranding is probably the manifestation of increased pressure in the collecting system in the early phase of ureteral obstruction. Perinephric stranding is easily identified on Spiral CT and less commonly seen on IVP
http://urologystone.com/CH06DiagnosisOfStones/helical.html

inflammatory reaction in the perirenal fat (perinephric stranding)
http://radiology.by/forum/viewtopic.php?f=8&t=166&start=10

Паранефрит (от греч. para - около, вблизи, nephros - почка, -itis - воспаление) - гнойно-воспалительное заболевание жировой капсулы (околопочечной жировой клетчатки)

воспаление околопочечной клетчатки называется паранефрит