Renal replacement lipomatosis
Chronic left loin pain.
Non-contrast CT of the Abdomen
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The left kidney is mildly enlarged with thinned parenchyma that most of it is replaced by fatty densities. This is associated with contracted left renal pelvis over a branching stag horn stone.
Preserved renal outline and mild perirenal fat stranding.
Left vesicoureteric junction small stone.
Multiple right renal small simple cortical cysts.
Large left Bockdalek hernia.
There is increased renal sinus fat with atrophic changes of the renal parenchyma with the remaining peripheral part delineates the renal outline. This is secondary to chronic calcular renal disease which is the more common cause.