title: Transvaginal sonography and rectal endoscopic sonography for the assessment of pelvic endometriosis: a preliminary comparison.
abstract: BACKGROUND
  Endometriosis and possible rectal involvement are difficult to assess by physical examination. Previous studies have shown the diagnostic value of magnetic resonance imaging and rectal endoscopic sonography (RES) in this setting, but not that of transvaginal sonography (TVS). The aims of this study were to compare the accuracy of TVS and RES for the diagnosis of pelvic endometriosis, and to compare the results with histological findings.
  
  
  METHODS
  In a prospective study, 30 consecutive patients referred with clinical signs of endometriosis underwent TVS and RES; the images were interpreted blindly with regard to physical findings.
  
  
  RESULTS
  Endometriosis was confirmed histologically in 28 (93%) of the 30 patients. Endometriomas were also present in 67% of cases. For the diagnosis of uterosacral endometriosis, the sensitivity, specificity, and positive and negative predictive values of TVS and RES were 75 and 75%, 83 and 67, 95 and 90%, and 45 and 40% respectively. For the diagnosis of rectosigmoid endometriosis, the sensitivity, specificity, and positive and negative predictive values of TVS and RES were 95 and 82%, 100 and 88%, 100 and 95%, and 89 and 64% respectively.
  
  
  CONCLUSIONS
  Despite the large proportion of our patients who had intestinal endometriosis, representing a possible source of bias, our results suggest that TVS is as efficient as RES for detecting posterior pelvic endometriosis and should therefore be used as the first-line examination.
authors.affiliation: Services de Radiologie, Hôpital Tenon, 4 rue de la Chine, 75020 Paris, France. marc.bazot@tnn.ap-hop-paris.fr
authors.forename: Marc
authors.initials: M
authors.lastname: Bazot
authors.forename: Romain
authors.initials: R
authors.lastname: Detchev
authors.forename: Annie
authors.initials: A
authors.lastname: Cortez
authors.forename: Paul
authors.initials: P
authors.lastname: Amouyal
authors.forename: Serge
authors.initials: S
authors.lastname: Uzan
authors.forename: Emile
authors.initials: E
authors.lastname: Daraï
mesh_terms: D000328:Adult; D004715:Endometriosis / Q000175:diagnosis / Q000000981:diagnostic imaging*; D019160:Endosonography / Q000379:methods / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D008875:Middle Aged; D010388:Pelvis; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012007:Rectum; D012680:Sensitivity and Specificity; D014463:Ultrasonography / Q000379:methods* / Q000706:statistics & numerical data; D014621:Vagina