Zahra Tavoli - School of Medicine Ziaeian Hospital Tehran University of Medical Sciences Tehran Iran Department of Obstetrics and Gynecology-Iran, Tehran
Zahra Asgari - Tehran University of Medical Sciences Tehran Iran Department of Obstetrics and Gynecology-Iran, Tehran
Fatemeh Afshari - Tehran University of Medical Sciences School of Medicine-Iran, Tehran Fatemeh Tabatabaei - Tabriz University of Medical Sciences Department of Obstetrics and Gynecology-Iran, Tabriz
Ali Montazeri - Health Metrics Research Centre Iranian Institute for Health Sciences Research ACECR Population Health Research Grou-Iran, Tehran

Backgrounds: Cysts of endometriosis of the ovary (endometriuma) is the most common form of endometriosis. Bilateral cystectomy can be associated with post-operative reduction in fertility, and risk of menopause due to unwanted removal or inactivation of ovarian follicles. However, unilateral cyctectomy with aspiration of opposite side could lessen these negative outcomes but it might be associated with increased recurrence rate. This study aimed to compare recurrence rate between these two methods of laparoscopy.Material and method: This retrospective cohort study was conducted on a sample of women with bilateral endometrioma undergoing bilateral cystectomy (group A) and unilateral cystectomy with drainage of opposite side (group B) between 2013 and 2015 in a teaching hospital affiliated to Tehran University of Medical Sciences. They were compared in sonographic recurrence one year following surgery. Also patients & apos; information and surgical reports were extracted from case records. Data were explored using chi-square and logistic regression analyses.Result: In all data for 75 patients were available for analysis (50 patients in group A and 25 patients in group B). Recurrence of the disease after 1 year was 31 (41.4%) in all patients, 17 (34%) patients in group A and 11 (44%) patients in group B. Althought recurrence rate in group B was higher, there was not significant difference in two groups (p = 0.58). However, after controling for age, and additional treatment by drug, the odds ratio for recurrence for group B compared to group A was 2.62 (95% CI: ).Conclusion: In general the findings indicated that recurrence rate was lower in bilateral cystectomy compared to unilateral cystectomy with drainage of opposite side, although the difference was mnot significant Studies with bigger sample size is suggested to confirm the findings