Background: Ovarian masses detected during pregnancy tend to spontaneously disappear. It is almost always functional cysts, follicular, corpora lutea and tecaluteinic cysts. Clinical case: Two cases of patients in the second trimester of pregnancy were reported in whom the diagnosis of adnexal masses was established in the ultrasound of the first trimester, with an increase in size and pain. Conclusions: The risk of malignancy in patients with adnexal masses is very low and surgical treatment is determined by symptoms of pain or rapid