n. an operation to free one or both ureters from surrounding abnormal adhesions or fibrous tissue (e.g. retroperitoneal fibrosis). It may also be performed prior to pelvic surgery to avoid intraoperative ureteric injury.
(RPF) a condition in which a dense plaque of fibrous tissue develops behind the peritoneum adjacent to the abdominal aorta. It may be secondary to malignancy, medication (methysergide, beta blockers), aortic aneurysm, or certain infections. The ureters become encased and hence obstructed, causing acute *anuria and renal failure. The obstruction can be relieved by *nephrostomy or the insertion of double J *stents. In the acute phase steroid administration may help, but in established RPF *ureterolysis is required.... retroperitoneal fibrosis
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