Background: Adnexal torsion in pregnancy is often associated with functional adnexal cysts, especially in pregnancies conceived by ovulation induction (OI) or in-vitro fertilization (IVF). During laparoscopy for adnexal de-torsion, drainage of the functional cysts can be attempted, although this procedure may cause bleeding.

Objectives: To investigate the characteristics of ovarian torsion in pregnancy associated with functional cysts and to compare the rate of torsion recurrence following de-torsion alone versus cyst drainage.

Methods: All cases of surgically diagnosed adnexal torsion occurring during pregnancy between January 2007 and April 2019 in our department were retrospectively analyzed. The cases of torsion associated with presumed functional ovarian cysts were selected. The rate of recurrent torsion during the same pregnancy was compared for de-torsion alone versus de-torsion and cyst aspiration.

Results: Of the 113 women who experienced adnexal torsion during pregnancy, 71 (67.0%) of torsion cases were caused by presumed functional ovarian cysts. Among women with torsion of functional ovarian cysts, the rate of torsion recurrence was significantly higher in patients who underwent de-torsion alone (n=28) compared to women who underwent aspiration and drainage of the ovarian cysts (n=43) (14.3% vs. 0, P = 0.021). There were no cases of intra- or post-operative bleeding in the study cohort.

Conclusions: Functional ovarian cysts are the most common adnexal pathology encountered in pregnant women with torsion. Intra-operative cyst aspiration and drainage may reduce the risk of recurrent torsion. Further multi-center studies are required to validate our data prospectively.