Characteristics of ovarian endometrioma during pregnancy.

Aim: During pregnancy, the ovarian endometrioma generally decreases in size and occasionally ruptures. We evaluated (1) whether and how ovarian-endometrioma size changes from the first trimester to the postdelivery period, and (2) the type of endometrioma more likely to rupture during pregnancy.

Methods: During an 18-year period (2000-2018), ultrasound in the first trimester revealed ovarian endometrioma in 149 pregnant women at our tertiary institute.