Guideline for Routine Screening and Surgical Decision‑Making in Proliferative Breast Lesions without Atypia
Risk Stratification
- Proliferative fibrocystic changes with apocrine adenosis are classified as proliferative lesions without atypia (along with sclerosing adenosis and usual ductal hyperplasia). This category carries a modestly increased but not high risk for future breast cancer compared with non‑proliferative lesions. – American College of Radiology [1][2]3
Imaging‑Pathology Concordance
- Radiologic‑pathologic concordance must be confirmed when a core‑needle biopsy yields benign proliferative changes. Concordance means the pathology adequately explains any imaging abnormality (e.g., a suspicious mass or calcifications). – National Comprehensive Cancer Network [4][5]
Management of Concordant Lesions
- When concordance is established, patients should return to routine annual screening mammography immediately; no surgical excision is required. – American College of Radiology [6][2]3
- Short‑interval (6‑month) follow‑up imaging is not indicated for proliferative lesions without atypia. Comparative studies showed no benefit in cancer detection, stage, tumor size, or nodal status versus routine annual screening. – American College of Radiology [6][3]
Management of Discordant or Indeterminate Lesions
- If the benign pathology does not fully account for suspicious imaging findings, surgical excision is warranted. – National Comprehensive Cancer Network [4][5]7
Specific Histologic Findings that Mandate Surgical Excision
| Histologic finding (core biopsy) | Reason for excision | Guideline source |
|---|---|---|
| Atypical ductal hyperplasia (ADH) | High‑risk lesion | NCCN [4][5][7] |
| Atypical lobular hyperplasia (ALH) or lobular carcinoma in situ (LCIS) when non‑concordant with imaging | High‑risk lesion | NCCN [4][5][7] |
| Pleomorphic LCIS | High‑risk lesion | NCCN [5][7] |
| Radiologic‑pathologic discordance (any benign pathology that does not explain imaging) | Potential missed malignancy | NCCN [4][5] |
| Other concerning histologies (e.g., mucin‑producing lesions, potential phyllodes tumor, papillary lesions, radial scars) | May harbor malignancy | NCCN [4][5][7] |
Evidence level: consensus‑based recommendations derived from expert panels and retrospective cohort data.
Diagnostic Pitfalls
- Apocrine cells naturally exhibit enlarged nuclei and prominent nucleoli, which can mimic malignancy; therefore, correlation with imaging (especially when imaging is BI‑RADS 2‑3) is essential to avoid unnecessary surgery. – NCCN 4
Long‑Term Surveillance
- All women aged ≥40 years should continue annual screening mammography, regardless of the presence of proliferative lesions without atypia. – American College of Radiology [6][2]3
- Mammographic specificity may be slightly reduced in this population due to tissue changes, but sensitivity remains unchanged. – American College of Radiology [6][3]
- MRI is not recommended as an enhanced screening modality for proliferative lesions without atypia because the risk does not meet high‑risk criteria. – American College of Radiology [1][6]
What Not to Do
- Do not schedule short‑interval (6‑month) follow‑up imaging for concordant proliferative lesions without atypia. – American College of Radiology [6][3]
- Do not perform diagnostic (rather than screening) mammography for asymptomatic follow‑up; routine screening mammography is sufficient. – American College of Radiology [1][6]2
Imaging Modality Recommendations for Breast Papillomatosis Surveillance
Preferred Imaging Techniques
- The American College of Radiology recommends using standard 2‑dimensional digital mammography or digital breast tomosynthesis (DBT) for routine surveillance of patients with breast papillomatosis when pathology is concordant and no atypia is present. 8
Advantages of Digital Breast Tomosynthesis
- Digital breast tomosynthesis decreases recall rates and the number of indeterminate findings compared with conventional 2‑D mammography, while maintaining comparable cancer detection performance. This benefit supports its use as the preferred screening modality in this population. 8