title: Idiopathic retroperitoneal fibrosis causing unilateral ureteral and sigmoid colon obstruction: A case report.
abstract: OBJECTIVE
  The present report aimed to present a unique case of idiopathic retroperitoneal fibrosis (RPF) presenting features of unilateral ureteral and sigmoid colon obstruction. RPF is a rare disorder with unclear etiology.
  
  
  METHODS
  A 43-year-old female had a 10-day history of lower right abdominal and lumbar pain. Gynecological examination, ultrasound, and computed tomography (CT) were all suggestive of right ovarian tumor. An enhanced CT showed right-sided hydronephrosis. The patient was diagnosed as having ovarian cancer. Ten days after hospitalization, a right intraureteral stent with a double-J catheter was inserted. Upon exploring the abdomen, unyielding RPF was encountered. A partial sigmoidectomy and colostomy were performed. Postoperative pathological results suggested idiopathic RPF. She received steroid treatments.
  
  
  CONCLUSIONS
  RPF is a rare disease that can be misdiagnosed. Our understanding about its presentation has to be improved and it should be considered as a differential diagnosis for patients presenting with abdominal diseases.
authors.affiliation: Department of Gynecology and Obstetrics, West China Second University Hospital, Sichuan University, Chengdu, Sichuan Department of Gynecology Department of Pathology, Guizhou Provincial People's Hospital, Guiyang, Guizhou, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Yan
authors.forename: Yujuan
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhijun
authors.initials: Z
authors.lastname: Liu
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Zhang
authors.forename: Qian
authors.initials: Q
authors.lastname: Wu
authors.forename: Mingrong
authors.initials: M
authors.lastname: Xi
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D006869:Hydronephrosis / Q000175:diagnosis; D007415:Intestinal Obstruction / Q000000981:diagnostic imaging / Q000209:etiology*; D010051:Ovarian Neoplasms / Q000175:diagnosis; D012185:Retroperitoneal Fibrosis / Q000150:complications* / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D012810:Sigmoid Diseases / Q000000981:diagnostic imaging / Q000209:etiology*; D014517:Ureteral Obstruction / Q000000981:diagnostic imaging / Q000209:etiology*