<qa>  What is the primary aim of this prospective study?The primary aim of this prospective study is to evaluate the performance of pelvic MRI examination with perfusion -and diffusion- weighted sequences and the application of the ADNEXMR SCORING system in ovarian tumors that cannot be classified by the IOTA Simple Rules regarding the prediction of malignancy. Secondary aims are the determination of the malignancy rate per ADNEXMR SCORING system class, the evaluation of interobserver reproducibility and the assessment of the accuracy of the specific diagnosis based on MRI images. 