Birads

ACR BI-RADS®–US Lexicon Classification Form

BI-RADS® – US

For each of the following categories, select the term that best describes the dominant lesion feature. Wherever possible, definitionsand descriptors used in BI-RADS® for mammography will be applied to ultrasound.

A. Masses: A mass occupies space and should be seen in two different projections. Shape (select one) DescriptionElliptical or egg-shaped (may include 2 or 3 undulations, i.e. “gently lobulated” or “macrolobulated”) Spherical, ball-shaped, circular, or globular Neither round nor oval in shape Description Long axis oflesion parallels the skin line (“wider than tall” or horizontal) Long axis, not oriented along the skin line (“taller than wide” or vertical, includes round) Description A margin that is well definedor sharp, with an abrupt transition between the lesion and surrounding tissue The mass has one or more of the following features: indistinct, angular, microlobulated or spiculated No cleardemarcation between a mass and its surrounding tissue Some or all of the margin has sharp corners, often forming acute angles Short cycle undulations impart a scalloped appearance to the margin of the massMargin is formed or characterized by sharp lines projecting from the mass Description The sharp demarcation between the lesion and surrounding tissue can be imperceptible or a distinct well-definedechogenic rim of any thickness No sharp demarcation between the mass and surrounding tissue, which is bridged by an echogenic transition zone Description Without internal echoes Having increasedechogenicity relative to fat or equal to fibroglandular tissue Mass contains both anechoic and echogenic components Defined relative to fat; masses are characterized by low-level echoes throughout (e.g.appearance of a complicated cyst or fibroadenoma) Having the same echogenicity as fat (a complicated cyst or fibroadenoma may be isoechoic or hypoechoic) Description No posterior shadowing or enhancement...