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Retroperitoneal fibrosis (RPF) is a rare disease cha racterized by the proliferation of inflammatory and fibrous tissue in the retroperitoneum. These masses are commonly loca lized around the infrarenal part of the ab­ dominal aorta and iliac arteries, often covering the ureters or other organs of the abdominal cavity; idiopathic diseases accounting for 70 % of cases. RPF may be associated with immunoglobulin G4 (IgG4), which accounts for two­thirds of idiopathic RPF cases. Secondary RPF may develop due to infections, malignant neoplasms, medica­ tion, retroperitoneal bleeding, or various other diseases. A cli nical case of idiopathic RPF, probably associated with IgG4, was described in a patient who had undergone a symptomatic surgical treatment in an urological clinic and continued being trea ted by a rheumatologist, given pathogenetic therapy (methylpredni solone and mycopheno­ late mofetil) with a significant improvement. For rheumatologists, this pathology is of an undoubted clinical inter­ est, since these changes are based on processes si milar to those occurring in systemic diseases of the connective tissue, and the RPF is extremely rare, ranging from 0.1 to 1.3 cases per 100,000 patients per year. However, more often than not, such patients are referred to the doctors of ancillary specialties (urologists, nephrologists, surgeons, vascular surgeons). All of the abovementioned facts emphasize the importance of analyzing such a clinical case.

A clinical case of the retroperitoneal fibrosis (Ormond's disease) in rheumatology practice