Table 3.
The frequency and prevalence of benign breast diagnoses and breast density categories
| Pathology from benign biopsy | BI-RADS breast density, No. (%)* | Total | |||
|---|---|---|---|---|---|
| Almost entirely fat | Scattered fibroglandular densities | Heterogeneously dense | Extremely dense | ||
| Nonproliferative | 1629 | 12527 | 14260 | 4110 | 32526 |
| (3.5%) | (26.9%) | (30.6%) | (8.8%) | (69.7%) | |
| Proliferative disease without atypia | 388 | 4247 | 5626 | 1681 | 11942 |
| (0.8%) | (9.1%) | (12.1%) | (3.6%) | (25.6%) | |
| Atypical hyperplasia | 65 | 768 | 1079 | 267 | 2179 |
| (0.1%) | (1.6%) | (2.3%) | (0.6%) | (4.7%) | |
| Total | 2082 | 17542 | 20965 | 6058 | 46647 |
| (4.5%) | (37.6%) | (44.9%) | (13.0%) | (100.0%) | |
* Using the Breast Imaging Reporting and Data System (BI-RADS) density categories: 1 = almost entirely fat (low density); 2 = scattered fibroglandular densities (average density); 3 = heterogeneously dense (high density); 4 = extremely dense (very high density).