title: Urinary endometriosis: MR imaging appearance with surgical and histological correlations.
abstract: OBJECTIVE
  The goals of the study were to describe the MR imaging features of endometriosis of the urinary tract and identify those that suggest intrinsic involvement of ureteric wall.
  
  
  METHODS
  Thirty-five women with proven urinary tract endometriosis and who had preoperative MR imaging between 2001 and 2011 were included retrospectively. MR images were intrepreted by one junior and one senior radiologists. To characterize the intrinsic parietal involvement, the ureteric circumference involved by the lesion of endometriosis was noted.
  
  
  RESULTS
  Thirty-eight ureteric and 13 bladder lesions were analyzed. They were found in association in nine women. Ureteric lesions were bilateral in seven women. Of the 38 ureteric lesions, 27 were extrinsic and 11 intrinsic at histopathological analysis. Sixteen women with extrinsic lesions and 10 with intrinsic ones were correctly identified on MR imaging. When the ureter was included less than 360° in the lesion, extrinsic involvement was confirmed in 80% of cases.
  
  
  CONCLUSIONS
  MR imaging appears to be more sensitive (91%vs 82%) but less specific (59% vs 67%) than surgery for the diagnosis of intrinsic form of ureteric location.
authors.affiliation: Department of Adult Radiology, Necker Children's Hospital, 149, rue de Sèvres, 75015 Paris, France.
authors.forename: S
authors.initials: S
authors.lastname: Sillou
authors.affiliation: Department of Adult Radiology, Necker Children's Hospital, 149, rue de Sèvres, 75015 Paris, France. Electronic address: sylvain.poiree@nck.aphp.fr.
authors.forename: S
authors.initials: S
authors.lastname: Poirée
authors.affiliation: Pediatric Department, Necker Children's Hospital, 149, rue de Sèvres, 75015 Paris, France.
authors.forename: A E
authors.initials: AE
authors.lastname: Millischer
authors.affiliation: Department of Gynecology, Cochin Hospital, 27, rue du faubourg Saint-Jacques, 75014 Paris, France.
authors.forename: C
authors.initials: C
authors.lastname: Chapron
authors.affiliation: Department of Adult Radiology, Necker Children's Hospital, 149, rue de Sèvres, 75015 Paris, France.
authors.forename: O
authors.initials: O
authors.lastname: Hélénon
mesh_terms: D000328:Adult; D004715:Endometriosis / Q000473:pathology* / Q000601:surgery*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D012189:Retrospective Studies; D014515:Ureteral Diseases / Q000473:pathology* / Q000601:surgery*; D001745:Urinary Bladder Diseases / Q000473:pathology* / Q000601:surgery*
keywords: Endometriosis; Magnetic Resonance Imaging; Pelvis; Ureter; Urinary Bladder