Table 1. Characteristics of Study Subjects.
| Parameter | Value |
|---|---|
| Mean age* (year) | 51.4 (20–94) |
| Sex, n (%) | |
| Women | 163 (82.7) |
| Men | 34 (17.3) |
| Sonographic features | |
| Composition | |
| Solid | 68 |
| Partially cystic | 105 |
| Cystic | 24 |
| Echogenicity | |
| Iso/hyperechogenicity | 140 |
| Hypoechogenicity | 51 |
| Marked hypoechogenicity | 6 |
| Shape | |
| Ovoid-to-round | 195 |
| Irregular | 2 |
| Orientation | |
| Parallel | 179 |
| Non-parallel | 18 |
| Margin | |
| Smooth | 149 |
| Spiculated/microlobulated | 21 |
| Ill-defined | 27 |
| Calcification | |
| None | 13 |
| Microcalcification | 34 |
| Macrocalcification/rim calcification | 26 |
| FNA/CNB result | |
| Category 1 | 2 |
| Category 2 | 30 |
| Category 3 | 133 |
| Category 4 | 6 |
| Category 5 | 3 |
| Category 6 | 21 |
| Final diagnosis, n (%) | 165 |
| Benign | 140 (84.8) |
| Malignant | 25 (15.2) |
| Diagnostic method, n (%) | |
| Benign | |
| Surgery | 1 (0.7) |
| CNB or FNA | 135 (96.4) |
| US finding | 4 (2.9) |
| Malignant | |
| Surgery | 19 (76) |
| CNB or FNA | 7 (24) |
*Data are expressed as median with range in parenthesis. CNB = core needle biopsy, FNA = fine needle aspiration, US = ultrasound