Table 5.
Breast Imaging Reporting and Data System Assessment, Median Time to First Diagnostic Test and Resolution, and Previous Breast Cancer, by Biopsy Results, San Francisco Bay Area, 1999–2001
| Characteristic | Invasive cancer % (n) | DCIS % (n) | Benign % (n) | LCIS/atypical hyperplasia % (n) |
|---|---|---|---|---|
| Sample size, n | 93 | 58 | 790 | 10 |
| Previous breast cancer | 8.6 (8) | 0 | 5.3 (42) | 20 (2) |
| Breast assessment by BIRADS | ||||
| 0 indeterminate | 6.5 (6) | 5.2 (3) | 16.6 (131) | 10 (1) |
| 3 probably benign | 4.3 (4) | 15.5 (9) | 62.9 (497) | 20 (2) |
| 4 suspicious | 59.1 (55) | 56.9 (33) | 18.5 (146) | 70 (7) |
| 5 highly malignant | 30.1 (28) | 22.4 (13) | 2 (16) | 0 |
| Median time to first test (days) | 8 | 17 | 55 | 21.5 |
| Mean time to first test (days) | 18.3 | 21 | 112.1 | 29.4 |
| Median time to resolution (days) | 17 | 30 | 76 | 39 |
| Mean time to resolution (days) | 43.8 | 35.1 | 127.2 | 44.8 |
| Percent resolved by 60 days | 88.8 | 86 | 47.1 | 80 |
DCIS, ductal carcinoma in situ; LCIS lobular carcinoma in situ.