Ovarian-Adnexal Reporting & Data System (O-RADS™)

O-RADS™ is an acronym for Ovarian-Adnexal Imaging-Reporting-Data System, a clinical support system for the standardized description and classification of ovarian/adnexal lesions.

The system consists of two complementary arms: 

  • Ultrasound (US) - the primary imaging modality, which is optimized for high sensitivity
  • Magnetic Resonance Imaging (MRI) - a secondary tool that allows higher specificity.

Both O-RADS US and O-RADS MRI employ lexicon terminology for describing the imaging characteristics of ovarian/adnexal lesions and data-based risk assessment categories to assign a risk of malignancy. The goal of the O-RADS system is to optimize ovarian cancer outcomes while minimizing unnecessary surgery in patients with adnexal lesions.


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Creative Commons License
Ovarian-Adnexal Reporting and Data System (O-RADS) by American College of Radiology  is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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Contact Us

For inquiries, please contact us at RADS@acr.org.