Table 3.
Distribution of lesion types by pathology in a total of 527 breast lesions
| Breast lesions | Lesion number | Percentage |
|---|---|---|
| Total breast lesions | 527 | NA |
| Total benign lesions | 316 | 60% (316/527) |
| Fibroadenoma | 114 | 36% (114/316) |
| Benign changes/stromal fibrosis | 77 | 24% (77/316) |
| Fibrocystic changes | 31 | 10% (31/316) |
| Papilloma | 28 | 9% (9/316) |
| Pseudoangiomatous stromal hyperplasia | 22 | 7% (22/316) |
| Fat necrosis | 18 | 6% (6/316) |
| Atypiaa | 14 | 4% (14/316) |
| Duct ectasia | 6 | 2% (6/316) |
| Adenosis | 4 | 1% (4/316) |
| Othersb | 2 | 1% (2/316) |
| Total malignant lesions | 211 | 40% (211/527) |
| Primary breast carcinomas | 209 | 99% (209/211) |
| Invasive ductal carcinoma | 138 | 66% (138/209) |
| Invasive mammary carcinoma with mixed ductal and lobular features | 30 | 14% (30/209) |
| Invasive lobular carcinoma | 26 | 12% (26/209) |
| Ductal carcinoma in situ | 15 | 7% (15/209) |
| Non-mammary malignancies in breast | 2 | 1% (2/211) |
| Malignant grade for invasive breast carcinomas | 194 | |
| Grade I | 50 | 26% (50/194) |
| Grade II | 92 | 47% (92/194) |
| Grade III | 52 | 27% (52/194) |
| Malignant grade for ductal carcinoma in situ | 15 | |
| Low grade | 7 | 46% (7/15) |
| Intermediate grade | 4 | 27% (4/15) |
| High grade | 4 | 27% (4/15) |
Numbers in parentheses represent the numerator and denominator for the corresponding percentage
aAtypia: 8 atypical ductal hyperplasia, 2 atypical lobular hyperplasia, 2 atypical papillary lesion, 1 radial scar with focal residual atypical hyperplasia associated with flat epithelial atypia, and 1 atypical/high-risk and fibrocystic changes
bOthers: 1 ductal hyperplasia and 1 organizing abscess with associated granulomatous reaction
Non applicable