Table 1.
Characteristics of all patients and those diagnosed with either malignant or benign incidental MRI-detected lesions or only malignant incidental MRI-detected lesions
| All patients N = 946 |
Patients with at least one incidental lesiona n = 166 |
Patients with at least one malignant incidental lesion n = 77 |
||||
|---|---|---|---|---|---|---|
| n | % | n | % | n | % | |
| Age (mean (years), SD, min–max) | 59.75, 11.75, 29–87 | 59.14, 11.85, 31–85 | 59.14, 12.19, 34–85 | |||
| Primary tumor histology | ||||||
| Invasive cancer of no special type | 672 | 71.0 | 118 | 71.1 | 52 | 67.5 |
| Lobular | 223 | 23.6 | 39 | 23.5 | 22 | 28.6 |
| Other | 51 | 5.4 | 9 | 5.4 | 3 | 3.9 |
| Intrinsic subtypeb | ||||||
| Luminal A | 322 | 34.0 | 67 | 40.4 | 36 | 46.8 |
| Luminal B | 515 | 54.4 | 84 | 50.6 | 35 | 45.5 |
| Basal-like | 63 | 6.7 | 8 | 4.8 | 2 | 2.6 |
| HER2-enriched | 46 | 4.9 | 7 | 4.2 | 4 | 5.2 |
| Breast density | ||||||
| A | 66 | 7.0 | 4 | 2.4 | 3 | 3.9 |
| B | 384 | 40.6 | 67 | 40.4 | 31 | 40.3 |
| C | 360 | 38.1 | 64 | 38.6 | 29 | 37.7 |
| D | 136 | 14.4 | 31 | 18.7 | 14 | 18.2 |
aBI-RADS category 3–5 lesions
bCutoff value of ≥ 1% was used to define positive hormone receptor status (estrogen and progesterone)