Introduction/Background The association of ovarian tumors and gravidoperitoneal state corresponds to any proliferative process developed at the ovarian level during pregnancy.

Methodology The objective of our study is to review this association through the study of cases collected in the department of obstetrics gynecology I at the university hospital Hassan II of Fez during the period January 2017/2023.

Results The age of our patients varies between 20–43 years with an average age of 32 years. 5 of our patients were on oral contraception. None of our patients had a family history of ovarian cancer or Lynch syndrome.

The diagnosis of ovarian tumor was made at different ages of pregnancy with an average of 17 years. The majority of our patients (11 cases) reported´ acute onset abdominal-pelvic or pelvic pain. Three of our patients presented with metrorrhagia.

Twelve patients underwent laparotomy during their pregnancy, six of them during the first trimester of pregnancy. The surgical procedure was a cystectomy in three cases, oophorectomy in seven cases, adnexectomy in one case, and extended surgery in one case (total hysterectomy with bilateral adnexectomy).

Conclusion Expectantation is recommended for ovarian tumors presumed to be benign and not progressing during pregnancy. The risk of miscarriage following surgery (laparoscopy and laparotomy) for ovarian tumor during pregnancy is estimated at 2.8%. The modalities of delivery should not be modified by the ovarian tumor, except in case of obstacle praevia, complication or suspicion of malignancy.

Disclosures The frequency of ovarian tumors discovered during pregnancy is between 0.3 and 5.4%. The most common benign organic ovarian tumors in pregnancy are dermoid cysts followed by cystadenomas. The main complication risk of ovarian tumors during pregnancy is adnexal torsion.

Tumor markers are not reliable during pregnancy. Ultrasound remains the reference examination to characterize an ovarian tumor during pregnancy. Its specificity is lower for the diagnosis of malignancy than outside pregnancy. Pelvic MRI is an efficient examination for the diagnosis of ovarian tumours during pregnancy and provides additional information to ultrasound.