Idiopathic Retroperitoneal Fibrosis
Rare inflammatory disorder in which abnormal formation of fiber-like tissue occurs behind the membrane that lines the cavity of the abdomen. This abnormal tissue growth often spreads to affect the tubes that carry urine from the kidney to the bladder, frequently causing blockage.
.1-1.3 cases per 100,000 persons per year; male-to-female ratio is 2:1-3:1
Typical Age of onset
● Pain in lower back or abdomen
● Weight loss
● Loss of appetite
● Swelling of one leg