Table 3. Comparison of Guidelines.
| Mass | JABTS | ACR BI-RADS |
|---|---|---|
| Shape | Oval/round, lobulated, polyponal, irregular | Oval, round, irregular |
| Margin | Well defined–smooth, rough | Circumscribed |
| Indistnct–with/without echogenic halo | Not circumscribed–indistinct, angular, microlobulated, spiculated | |
| Obscure | ||
| Orientation | Small (depth/width ratio < 0.7), large (≥ 0.7) | Parallel, non-parallel |
| Echogenicity | Echolevel–anechoic, hyper-, hypo-, isoechoic | Anechoic, hyper-, hypo-, isoechoic, complex cystic and solid, heterogeneous |
| Homogeneity–heterogeneous, homogeneous | ||
| Non-mass | Ductal dilatations with internal echoes, hypoechoic area in mammary gland, architectural distortion |
ACR = American College of Radiology, BI-RADS = breast imaging-reporting and data system, CNB = core needle biopsy, FNAB = fine needle aspiration biopsy, FU = follow-up, JABTS = Japanese Association of Breast and Thyroid Sonology