title: Patterns of and risk factors for recurrence in women with ovarian endometriomas.
abstract: OBJECTIVE
  To identify risk factors for and the patterns of recurrence of endometrioma and of dysmenorrhea in women with ovarian endometrioma.
  
  
  METHODS
  We evaluated 710 consecutive patients operated on for ovarian endometriomas who were followed up for an average of 22.4 months. Twenty factors were examined to assess their effect on risk of recurrence of endometrioma and of dysmenorrhea using survival analysis. Hazard rate also was estimated to examine recurrence patterns.
  
  
  RESULTS
  For recurrence of endometrioma, the revised American Fertility Society (rAFS) score, younger age at surgery, and previous medical treatment of endometriosis were identified to be risk factors. For recurrence of dysmenorrhea, rAFS score was the only risk factor. For both recurrences, there was a constant hazard rate in the first 28-30 months after surgery, indicating that the recurrence in that period is completely random. After that period, the hazard rate increased dramatically.
  
  
  CONCLUSIONS
  The total rAFS score, but not rAFS stage, is a risk factor for recurrence of both endometrioma and dysmenorrhea, indicating that the rAFS stage has little prognostic value. The existence of a completely random recurrence period may be a universal phenomenon, with its duration and the magnitude of recurrence risk determined by patient characteristics and quality of care. The second phase of much higher recurrence risk may reflect successful reseeding, reimplantation, and regrowth of ectopic endometrium. Therefore, the identification of risk factors as well as patterns of recurrence should shed better light on possible causes for recurrence, which is now poorly understood.
authors.affiliation: Department of Gynecology, Shanghai OB/GYN Hospital, Shanghai, China.
authors.forename: Xishi
authors.initials: X
authors.lastname: Liu
authors.forename: Lei
authors.initials: L
authors.lastname: Yuan
authors.forename: Fanghua
authors.initials: F
authors.lastname: Shen
authors.forename: Zhilin
authors.initials: Z
authors.lastname: Zhu
authors.forename: Hongyuan
authors.initials: H
authors.lastname: Jiang
authors.forename: Sun-Wei
authors.initials: SW
authors.lastname: Guo
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D004412:Dysmenorrhea / Q000453:epidemiology / Q000601:surgery*; D004715:Endometriosis / Q000453:epidemiology / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D010535:Laparoscopy; D008875:Middle Aged; D010049:Ovarian Diseases / Q000453:epidemiology / Q000601:surgery*; D011184:Postoperative Period; D011379:Prognosis; D012086:Reoperation; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D055502:Secondary Prevention; D016019:Survival Analysis; D013997:Time Factors; D016896:Treatment Outcome