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Table 2 Prospective characterization of 1211 solid nodules into BIRADS categories (all 1211 nodules have undergone biopsy)

From: Sonographic evaluation of solid breast nodules

BIRADS category Number of nodules biopsied Number of malignant nodules Expected risk of cancer (%) Actual risk of cancer (%)
2 15 0 0 0
3 231 1 ≤2 0.4
4a 515 52 3–49 10
4b 191 118 50–89 62
5 259 236 ≥90 91
Total 1211 407   34