Table 1.
Ultrasound characteristics of the masses included in the study (n = 555).
| Variable | Category | n (%) | ||
|---|---|---|---|---|
| Shape | Oval | 251 (45.2) | ||
| Round | 29 (5.2) | |||
| Irregular | 275 (49.5) | |||
| Margins | Circumscribed | 200 (36.0) | ||
| Non-circumscribed | 355 (64.0) | |||
| Orientation | Parallel | 390 (70.3) | ||
| Not parallel | 165 (29.7) | |||
| Echo pattern | Hypoechoic | 430 (77.5) | ||
| Isoechoic | 28 (29.7) | |||
| Hyperechoic | 7 (1.3) | |||
| Heterogeneous | 66 (11.9) | |||
| Posterior features | None | 447 (80.5) | ||
| Shadowing | 68 (12.3) | |||
| Enhancement | 38 (6.8) | |||
| Combined pattern | 2 (0.4) | |||
| Size | 0-10 mm | 196 (35.3) | ||
| 11-20 mm | 311 (56.0) | |||
| > 20 mm | 48 (8.7) | |||
| BI-RADS | 2a | 14 (2.5) | ||
| 3 | 102 (18.4) | |||
| 4A | 181 (32.6) | |||
| 4B | 74 (13.3) | |||
| 4C | 135 (24.3) | |||
| 5 | 49 (8.8) | |||