<qa>  What is the IOTA-MRI project linked to?The IOTA-MRI project is linked to the IOTA study. In this multicenter study different diagnostic ultrasound algorithms are tested prospectively in patients with an ovarian mass prior to surgery. This study allows to define a subgroup of patients in which Simple Rules are inconclusive, in other words the population eligible for inclusion in the IOTA-MRI project. We plan to include 250 patients in the IOTA-MRI study. Patients will be included consecutively, yet only after completing the informed consent. Recruitment will take 2 years of time as of the start of the individual center. 