[Retroperitoneal fibrosis].

Retroperitoneal Fibrosis (RPF) is a rare disease with peak incidence in the fifth to seventh decades of life. Its etiology remains to a great extent unclear; however, many characteristics of the disease suggest an autoimmune origin. Distinction is made between primary/idiopathic and secondary RPF. Symptoms may be general/nonspecific or localized (due to replacement or compression of organs). In addition to patient history, laboratory analysis and radiologic examinations, diagnosis often requires biopsy taken from the area affected. After restoring the function of involved (hollow) organs, medical therapy with prednisone, immunosuppressive drugs or tamoxifen is aimed at converting active disease to stable disease. However, some patients require ureteral surgery due to unsuccessful treatment. Life-long follow-up of patients is necessary since RPF can show a chronically relapsing course.