Background: So far, only 21 descriptions of accessory ovary have been reported since 1959. However, the true incidence of this condition is probably underestimated because the pathologic forms (ovarian tumors and endometriosis) are probably more often diagnosed and reported.
Case: We report the incident discovery of one right accessory ovary during a laparoscopic tubal sterilization. This accessory ovary was asymptomatic and structurally normal. It was connected serial to the right utero-ovarian ligament and left in situ. There was no other anomaly.
Conclusion: Gynaecologic surgeons must be aware of this possibility when removal of the whole ovarian tissue is needed.