title: Prevalence of endometriosis in malignant epithelial ovary tumours.
abstract: OBJECTIVE
  To determine the prevalence of ovarian endometriosis in malignant epithelial ovarian tumours.
  
  
  METHODS
  A retrospective analysis of 160 malignant and 23 borderline ovarian tumours during the period 1995-2001.
  
  
  RESULTS
  Fourteen (7.7%) of the tumours contained endometriosis. This affected 22% of the endometrioid and 10.8% of the mixed adenocarcinomas. The mean age of the ovarian endometriosis patients was 43+/-13 range 26-70 years. The incidence in borderline tumours 13% (3/23) was higher than that in ovarian cancer 6.9% (11/160) (P>0.05). Eight (57%) of cases were classified as atypical and six (43%) as typical endometriosis. Nine cases were FIGO (International Federation of Gynaecology and Obstetrics) stage I and 5 stage III.
  
  
  CONCLUSIONS
  Both malignant and borderline ovarian tumours are associated with ovarian endometriosis. In addition, atypical endometriosis was found associated with endometrioid and mixed epithelial ovarian tumours.
authors.affiliation: Department of Obstetrics & Gynecology, Cerrahpasa Medical Faculty, Istanbul University, Istanbul, Turkey. oral@superonline.com
authors.forename: Engin
authors.initials: E
authors.lastname: Oral
authors.forename: Sennur
authors.initials: S
authors.lastname: Ilvan
authors.forename: Esra
authors.initials: E
authors.lastname: Tustas
authors.forename: Begum
authors.initials: B
authors.lastname: Korbeyli
authors.forename: Tugan
authors.initials: T
authors.lastname: Bese
authors.forename: Fuat
authors.initials: F
authors.lastname: Demirkiran
authors.forename: Macit
authors.initials: M
authors.lastname: Arvas
authors.forename: Derin
authors.initials: D
authors.lastname: Kosebay
mesh_terms: D000230:Adenocarcinoma / Q000150:complications; D002288:Adenocarcinoma, Mucinous / Q000150:complications; D000328:Adult; D000368:Aged; D018269:Carcinoma, Endometrioid / Q000150:complications; D018284:Cystadenocarcinoma, Serous / Q000150:complications; D004715:Endometriosis / Q000150:complications* / Q000453:epidemiology / Q000473:pathology; D005260:Female; D006801:Humans; D008875:Middle Aged; D010049:Ovarian Diseases / Q000150:complications* / Q000453:epidemiology / Q000473:pathology; D010051:Ovarian Neoplasms / Q000150:complications*; D017698:Postmenopause; D012189:Retrospective Studies