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Background:Retroperitoneal fibrosis (RPF) is an uncommon disease that is characterized by development of fibrosclerotic tissues involving retroperitoneal structures.This study aimed to investigate the clinical features of 30 patients with RPF in a single center in Beijing in a 10-year period.Methods:We retrospectively analyzed clinical data on demographic characteristics,clinical manifestations,laboratory findings,radiological findings,modalities of treatments,outcomes and prognosis of 30 patients with RPF.Patients were treated in Beijing Chao-Yang Hospital between January 2003 and December 2013.Results:The mean age of patients with RPF was 56.7 ± 14.4 years.Twenty-three patients were men and seven patients were women.Acute phase reactants were elevated in most patients.Rheumatic factor was positive in 4/25 (16.0％) patients,and antinuclear antibody was positive in 6/22 (27.3％) patients.Elevation of IgG4 was observed in 9/22 (40.9％) patients.The most common type was I + Ⅲ (n =13),followed by Ⅰ + Ⅱ +Ⅲ (n =12).Five patients undertook an 18F-fluoro-deoxy-D-glucose positron emission tomography examination and increased uptake was detected in four patients.Eight patients received combination therapy with glucocorticoids and tamoxifen.Surgical intervention treatments included intraureteral double-J stent implantation (n =26),percutaneous nephrostomy (n =2),open ureterolysis and intraperitonealization of the ureters (n =5) and Iaparoscopic ureterolysis and intraperitonealization of the ureters (n =5).Three patients underwent hemodialysis because of renal failure.Conclusions:Clinical characteristics of RPF patients in our study are similar to those previously reported.Steroids and immunosuppressive therapy combined with ureterolysis could be a viable choice of treatment for RPF.More prospective,multi-center studies with a longer follow-up are warranted.