The Ovarian/Adnexal Reporting and Data System for Ultrasound: From Standardized Terminology to Optimal Risk...

Area of Science:

• Radiology
• Gynecologic Imaging
• Ultrasound Diagnostics

Background:

• The American College of Radiology (ACR) Ovarian-Adnexal Reporting and Data System (O-RADS) was developed to standardize the characterization and management of ovarian and adnexal pathology using ultrasound (US).
• Harmonizing reporting and patient management strategies is crucial for improving outcomes in gynecologic imaging.

Purpose of the Study:

• To evaluate the diagnostic accuracy and inter-reader agreement of the O-RADS US lexicon and risk assessment tool.
• To assess the performance of O-RADS US in detecting ovarian cancer and stratifying malignancy risk.

Main Methods:

• Review of multiple validation studies on the O-RADS US system.
• Analysis of diagnostic accuracy, with a focus on O-RADS 4 as a cut-off for ovarian cancer detection.
• Assessment of inter-reader agreement across different radiologist experience levels and comparison with other established systems (GIRADS, ADNEX, IOTA).

Main Results:

• O-RADS US demonstrates excellent diagnostic accuracy, with O-RADS 4 often serving as the optimal threshold for identifying ovarian cancer.
• High levels of inter-reader agreement are consistently observed, irrespective of radiologist training or experience.
• The O-RADS US risk stratification system performs within expected malignancy risk ranges per category, correlating with system descriptors.

Conclusions:

• The O-RADS US lexicon and risk assessment tool provide a reliable and reproducible framework for evaluating adnexal masses.
• O-RADS US shows comparable or superior inter-reader agreement to other established gynecologic imaging reporting systems.
• Future research will focus on refining O-RADS US terminology and risk categories based on accumulated validation data.