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Table 2 BI-RADS US descriptors

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

US descriptorFeatures favoring benignFeatures favoring malignantIndeterminate features
Shape of massOvalIrregular 
Orientation of massParallel to skinNot parallel to skin 
Margin of massCircumscribedMicro-lobulated, indistinct, angular, or spiculated 
Lesion boundaryAbrupt interfaceEchogenic halo 
Echo patternAnechoic or hyperechoicComplexIsoechoic or hypoechoic
Posterior acoustic features Shadowing or combined patternEnhancement or no posterior acoustic features