renal sinus lipomatosis

renal sinus lipomatosis, increased fat in the renal sinuses. A symmetric, usually asymptomatic, increase is seen in obesity, steroid therapy, and the atrophy that accompanies the aging process. An asymmetric increase known as renal replacement lipomatosis, which can have severe symptoms, occurs when infection destroys part of the renal parenchyma. See also renal replacement lipomatosis.