Introduction/Background The diagnosis of ovarian cancer is often established at a late stage of the disease with the absence of universal screening method.The RMI1 (Risk of malignancy index 1) and ADNEX MR score were established to predict the risk of malignancy of a suspicious ovarian mass.

Methodology This was a descriptive,longitudinal. Retrospective, moncentrique and comparative study conducted in the department of gynecology C, spread over a period of 03 years (from January 2019 to December 2021) conducted among women operated for suspected ovarian mass and meeting the criteria of suspicion. 89 patients were included in the work. Women who were lost to follow-up were excluded.

The purpose of our work was to evaluate the performance of RMI1 and ADNEX MR score in the evaluation of the risk of malignancy of ovarian masses.

Results The suspected ovarian mass was malignant in 60.2% of cases.RMI1 score greater than or equal to 200 suggestive of malignancy was observed in 70.5% of the cases.

The RMI1 score was significantly higher for malignant tumor(p=0.003). With an area under the ROC curve at 68.9%.

The ADNEX MR score was significantly higher in cases of malignancy (p<0.001), and MRI was effective in detecting peritoneal implants in 29.5% of cases(n=26).This score had an AUC evaluated at 83.4%.

A septated appearance was observed on MRI in 67 cases (76.1%).The mass was bilateral in 23 cases (26.1%) and complex in 56 cases (63.6%).

There was no difference between ultrasound and MRI in terms of visualisation of septations, solid component, ascites and bilaterality of lesions.

No peritoneal mestastases were detected on ultrasound examination. MRI was more effective in isolating 26 implants.

Conclusion ADNEX MR score out performs RMI 1 in predicting the risk of malignancy in ovarian masses.

RMI1 ultrasound score is also an effective tool for primary care physicians in case of diicult access to MRI.

Disclosures No Financial or other competing interests.