Table 1. Characteristics of Overall 253 Breast Masses.
| Characteristics | Benign (n = 173) | Malignant (n = 80) | P |
|---|---|---|---|
| Age of patients (years) | 44.0 (40.0–51.0) | 51.5 (46.0–61.0) | < 0.001 |
| B-mode US | |||
| Size (cm) | 1.0 (0.7–1.3) | 1.7 (1.2–2.5) | < 0.001 |
| Pathologic diagnosis | - | ||
| Fibroadenoma | 43 (24.8) | - | |
| Fibrocystic change | 6 (3.4) | - | |
| Intraductal papilloma | 6 (3.4) | - | |
| Phyllodes tumor | 5 (2.9) | - | |
| Stromal fibrosis | 2 (1.2) | - | |
| Fibroadenomatoid mastopathy | 2 (1.2) | - | |
| Adenosis | 2 (1.2) | - | |
| Lobular carcinoma in situ | 1 (0.6) | - | |
| Cyst* | 1 (0.6) | - | |
| N/A† | 105 (60.7) | ||
| Invasive ductal carcinoma | - | 67 (83.7) | |
| Ductal carcinoma in situ | - | 9 (11.3) | |
| Invasive lobular carcinoma | - | 3 (3.7) | |
| Invasive papillary carcinoma | - | 1 (1.3) |
Numeric data are presented as median (interquartile range). Non-numeric data are presented as number of lesions (percentage). *One cyst was diagnosed based on typical ultrasonographic features, without biopsy, †Benign mass assessed by Breast Imaging Reporting and Data System 2 or 3, and all with stability on follow-up US for at least 1 year. N/A = not available, US = ultrasound