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Breast MRI Lesion Descriptors, by BI-RADS Category 4 Subdivision
| Descriptor | 4A (n = 40) | 4B (n = 29) | 4C (n = 6) | 4 (NOS) (n = 7) |
|---|---|---|---|---|
|
| ||||
| Focus | 1 (3) | 0 (0) | 0 (0) | 1 (14) |
| Mass | 16 (40) | 15 (52) | 4 (67) | 2 (29) |
| Nonmass enhancement | 23 (58) | 14 (48) | 2 (33) | 4 (57) |
| Mean size (mm), range | 11 (4–37) | 15 (5–50) | 19 (1–28) | 10 (4–22) |
Note—Except where otherwise indicated, data are number (%) of lesions. NOS = not otherwise specified.
