Question: What is (are) Retroperitoneal fibrosis ?
Answer: Retroperitoneal fibrosis is a slowly progressive disorder in which the tubes that carry urine from the kidneys to the bladder (ureters) and other abdominal organs are blocked by a fibrous mass and inflammation in the back of the abdomen. The disorder may cause chronic unilateral obstructive uropathy or chronic bilateral obstructive uropathy. Risk factors for retroperitoneal fibrosis include asbestos exposure, smoking, tumor, infection, trauma, radiotherapy, surgery, and use of certain drugs.
Source: GARD