Table 2.

BI-RADS descriptors for breast ultrasonography

Shape	Oval, round, irregular
Orientation	Parallel, nonparallel
Margin	Circumscribed Indistinct, angular, microlobulated, spiculated
Lesion boundary	Abrupt interface, echogenic halo
Echo pattern	Anechoic, hyperechoic, complex, hypoechoic, isoechoic
Posterior acoustic features	Absent, enhancement, shadowing, combined
Associated findings	Ductal change, Cooper's ligament changes, edema, architectural distortion, skin thickening, skin retraction/irregularity
Calcifications	Macrocalcifications, microcalcifications in the mass, microcalcifications out of the mass
Special cases	Clustered microcysts, complicated cysts
Final assessment	Category 2, category 3, category 4, category 5

BI-RADS, Breast Imaging Reporting and Data System.