Nonmass Lesions on Breast Ultrasound: Radiologic-Pathologic Correlation and a Practical Guide to Diagnostic Approach

Area of Science:

• Radiology
• Medical Imaging
• Breast Imaging

Background:

• Nonmass lesions (NMLs) are frequently encountered during breast ultrasound (US) examinations.
• These lesions lack the distinct characteristics of a mass, making differentiation difficult, especially for less experienced operators.

Purpose of the Study:

• To illustrate the sonographic features of NMLs and their pathologic correlations.
• To provide a structured diagnostic approach for managing NMLs.

Main Methods:

• Review of sonographic features of NMLs with pathologic correlations.
• Categorization of NMLs into benign, benign with upgrade potential, and malignant.

Main Results:

• Detailed description of sonographic characteristics of various NMLs.
• Illustrative examples of benign and malignant NMLs are provided.

Conclusions:

• Accurate characterization of NMLs on US is crucial for appropriate patient management.
• The upcoming Breast Imaging Reporting and Data System (BI-RADS) may include NMLs as a distinct category, highlighting their clinical significance.