Replacement lipomatosis of the kidney is a severe loss of renal parenchyma with massive fat deposition associated with long-standing inflammation and calculi. We report two pathologically proven cases of total replacement lipomatosis and one partial replacement lipomatosis diagnosed by CT. The CT images demonstrated a large fat-attenuating mass with perirenal capsule surrounded by thick pararenal fascia, streaky densities in the mass, elongated collecting system, large calculi, and absence of renal parenchyma.
Sönmez, G., Mutlu, H., Özturk, E., Sildiroǧlu, O., Akyol, I., Başekim, C. Ç., & Kizilkaya, E. (2008). Replacement lipomatosis of the kidney: MRI features. European Journal of General Medicine, 5(3), 184–186.