title: Rare case of perplexing ovarian endometriosis.
abstract: OBJECTIVE
  To document a rare case of coexisting endometriosis and mature cystic teratoma in the same ovary.
  
  
  METHODS
  Case report.
  
  
  METHODS
  Gynecology unit in a tertiary training and teaching hospital in Cape Town, South Africa.
  
  
  METHODS
  A 30-year-old healthy nulligravida woman with a large ovarian tumor.
  
  
  METHODS
  After a basic examination, a diagnostic and management laparotomy was performed. A unilateral oophorectomy and staging laparotomy were performed.
  
  
  METHODS
  Final diagnosis of a complex ovarian tumor.
  
  
  RESULTS
  Histologic analysis confirmed endometriosis of the pelvis and concomitant compound pathology in the right ovary, which included endometriosis, mature teratoma, and mucinous cystadenoma.
  
  
  CONCLUSIONS
  Co-existence of varied pathology in a single organ presents a challenge to the pathologist and the clinician. Accurate clinical (i.e., surgical) assessment and decisive histologic verification forms a critical part in this process. This case of coexisting endometriosis and teratoma in a single ovary is, to our knowledge, only the third case reported in literature.
authors.affiliation: Department of Obstetrics and Gynaecology, Tygerberg Hospital and Stellenbosch University, Tygerberg, South Africa. drhvdm@gmail.com
authors.forename: Johannes L
authors.initials: JL
authors.lastname: van der Merwe
authors.forename: Igno
authors.initials: I
authors.lastname: Siebert
authors.forename: Abraham C
authors.initials: AC
authors.lastname: van Wyk
mesh_terms: D000328:Adult; D015897:Comorbidity; D004715:Endometriosis / Q000175:diagnosis / Q000453:epidemiology* / Q000601:surgery; D005260:Female; D006801:Humans; D010535:Laparoscopy; D010049:Ovarian Diseases / Q000175:diagnosis / Q000453:epidemiology* / Q000601:surgery; D010051:Ovarian Neoplasms / Q000175:diagnosis / Q000453:epidemiology* / Q000601:surgery; D010052:Ovariectomy; D013724:Teratoma / Q000175:diagnosis / Q000453:epidemiology* / Q000601:surgery; D016896:Treatment Outcome