- to familiarize the readers with O-RADS MRI scoring system;
- to explain the role of O-RADS MRI Risk Stratification System in assessment of ovarian lesions;
- to present ovarian lesions and O-RADS MRI scores based on the reports from our institution.

Introduction

Adnexal masses are common in clinical practise in both pre- and postmenopausal women and most of them are benign. Benign adnexal lesions include simple or hemorrhagic cyst, dermoid or endometrioma and can be adequately categorized on ultrasound (US) [1]. However, due to wide spectrum of pathology, adnexal lesions can present a diagnostic challenge and up to one third of all adnexal masses remain indeterminate after US [2].
Magnetic resonance imaging (MRI) can be problem solving tool. It can improve diagnostic reliability with high soft-tissue resolution allowing determination of the type of the lesion and staging of the disease. MRI examination is helpful in the evaluation of a large mass of and a mass with undetermined origin as well [3]. All of the above mentioned lead to the accurate diagnosis and the optimal treatment for...

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Imaging findings of the adnexal lesion should be evaluated in correlation with clinical data such as patient history and tumour markers. Although benign lesion can be correctly assessed on US, MRI plays a vital role in precise characterization of undetermined or suspicious adnexal lesions. O-RADS MRI Risk Stratification System allows radiologists to further improve the accuracy of adnexal lesion identification. Additionally, O-RADS MRI lexicon provides better communication between radiologists and clinicians and optimal management for the patient.

References
1. Andreotti RF, Timmerman D, Strachowski LM, Froyman W, Benacerraf BR, Bennett GL, et al. O-RADS US Risk Stratification and Management System: A Consensus Guideline from the ACR Ovarian-Adnexal Reporting and Data System Committee. Radiology. 2020;294(1):168-85.
2. Timmerman D, Van...

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