O-RADS Ultrasound: A User's Guide, From the AJR Special Series on Radiology Reporting and Data Systems.

The Ovarian/Adnexal Reporting and Data System (O-RADS) is a lexicon and risk stratification tool designed for the accurate characterization of adnexal lesions and is essential for optimal patient management. O-RADS is a recent addition to the American College of Radiology (ACR) reporting and data systems and consists of ultrasound (US) and MRI arms. Since most ovarian or adnexal lesions are first detected with US, O-RADS US is considered the primary assessment tool. Application of O-RADS US is recommended whenever a non-physiologic lesion is encountered. Lesion characterization may be streamlined using an algorithmic approach focused on relevant features and an abbreviated version of the lexicon. Resources to expedite O-RADS US categorization and determination of a management recommendation include easy online access to the ACR color-coded risk stratification scorecard and an O-RADS US calculator that is available as a smartphone app. Reporting should be concise and include relevant features for risk stratification, adhering to lexicon terminology. Technical considerations include optimization of grayscale and color Doppler technique and performance of problem-solving maneuvers to help avoid common pitfalls. This review provides a user-friendly summary of O-RADS US with practical tips for everyday clinical use.