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Table 2 BI-RADS US descriptors

From: Breast lesions in women under 25 years: radiologic-pathologic correlation

US descriptor

Features favoring benign

Features favoring malignant

Indeterminate features

Shape of mass

Oval

Irregular

 

Orientation of mass

Parallel to skin

Not parallel to skin

 

Margin of mass

Circumscribed

Micro-lobulated, indistinct, angular, or spiculated

 

Lesion boundary

Abrupt interface

Echogenic halo

 

Echo pattern

Anechoic or hyperechoic

Complex

Isoechoic or hypoechoic

Posterior acoustic features

 

Shadowing or combined pattern

Enhancement or no posterior acoustic features