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: 1) US - the primary imaging modality, which is optimized for high sensitivity and 2) MRI - a problem-solving 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.


ORADS™ can also be accessed via the ACR Guidance App. Learn more»

License Information
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.

Permissions beyond the scope of this license may be available by submitting a Permission Request Form.


ACR disclaims liability for any acts or omissions that occur related to an individual's or entity's use of ACR's RADS, including but not limited to, translations of a specific RADS work.

For a full list of RADS Translated documents, please visit the RADS Translations page

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Contact Us

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