BI-RADS 3 for magnetic resonance imaging

Area of Science:

• Radiology
• Oncology
• Medical Imaging

Background:

• Breast Imaging Reporting and Data System (BI-RADS) 3 assessments are assigned to approximately 7-12% of breast MRI scans.
• The specific imaging characteristics of these 'probably benign' lesions on MRI are not well-established.
• Current guidelines suggest a BI-RADS 3 classification should correspond to a malignancy likelihood of less than 2%.

Purpose of the Study:

• To define the imaging features of probably benign lesions on breast magnetic resonance (MR) imaging.
• To improve the accuracy of BI-RADS 3 assessments in breast MRI interpretation.
• To differentiate truly benign findings from those requiring further investigation.

Main Methods:

• Review of breast MRI examinations with BI-RADS 3 assessments.
• Analysis of imaging characteristics including lesion morphology, enhancement patterns, and kinetics.
• Correlation of imaging findings with follow-up data or biopsy results.

Main Results:

• Identification of specific mass, focus, and non-mass enhancement features associated with a probably benign assessment on baseline MRI.
• Establishment of criteria to distinguish BI-RADS 3 lesions from those with higher malignancy potential.
• Demonstration that certain classically benign findings should not receive a BI-RADS 3 classification.

Conclusions:

• Clearly defined imaging features can support a BI-RADS 3 assessment on breast MRI.
• Accurate characterization of probably benign lesions reduces unnecessary biopsies and patient anxiety.
• Adherence to defined criteria ensures appropriate use of the BI-RADS 3 category, reserving it for lesions with a <2% chance of malignancy.