Pictorial review of nonmass breast ultrasound lesions using BI-RADS v2025

BI-RADS v2025 formally incorporates nonmass lesions (NMLs) on breast ultrasound, which have a high malignancy rate. A pictorial review classifies NMLs by distribution—segmental, linear, focal, regional—showing benign/malignant cases, descriptors, and multimodality correlation.

• NMLs lack discrete margins and shape, making identification challenging; technical factors like patient positioning and transducer orientation affect detection.
• Cases illustrate echo patterns, posterior features, and associated findings per BI-RADS v2025, with correlation to mammography, MRI, contrast-enhanced mammography, and PET-CT.
• The article aims to promote consistent reporting and lay groundwork for future systematic data collection on nonmass lesions.

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