Ormond disease - idiopathic retroperitoneal fibrosis - is a rare condition characterized in situ by the development of fibrous plaques in the retroperitoneal space and anatomicaly dependent structures. The associated encasement of both ureters and progress to hydronefrosis of the kidney are typical clinical manifestations. Less typical manifestations are possible (for example chronic periaortitis), where clinical diagnosis is more difficult. The laboratory findings are not specific for this disease and a biopsy is not always possible for anatomical reasons. In these cases, the use of positron emission tomography/computed tomography - has been found to be the solution, specifically for patients with periaortitis. Ormond disease is generally idiopathic, and secondary - to the use of certain drugs, malignant diseases, infections. Idiopathic retroperitoneal disease is thought to result from the clinical manifestation of a systemic autoimmune disease. The purpose of this article is to present two casuistics, one of a less than usual clinical manifestation. Both positron emission tomography/computed tomography were used in the diagnostics. The treatment ofOrmond disease involves the combination of surgical and immunosuppressive treatment.