Clinical Practice Guidelines for Intraductal Papilloma: CSBrS 2021

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Clinical Practice Guidelines for Intraductal Papilloma: Chinese Society of Breast Surgery (CSBrS) Practice Guidelines 2021

Intraductal papilloma, a benign breast lesion accounting for 5.3% of all benign breast diseases, presents significant clinical challenges due to its potential for pathological progression, including atypical ductal hyperplasia (ADH) and malignant transformation. High rates of diagnostic underestimation during biopsy and the risk of relapse further complicate management. The 2021 guidelines by the Chinese Society of Breast Surgery (CSBrS) provide evidence-based recommendations for the diagnosis and treatment of intraductal papilloma, aiming to standardize clinical practice across China.

Classification and Clinical Presentation

Intraductal papillomas are classified into central and peripheral types based on anatomical and histological features. Central papillomas arise from large ducts beneath the areola and commonly manifest as unilateral bloody or serous nipple discharge, often accompanied by a palpable mass near the areola. Peripheral papillomas originate from terminal ductal-lobular units, are frequently asymptomatic, and are detected incidentally during imaging. Peripheral lesions constitute approximately 10% of cases and may present as masses without discharge.

Diagnostic Recommendations

The guidelines emphasize a multimodal diagnostic approach tailored to lesion type and clinical presentation.

1. Clinical Evaluation

Nipple discharge (bloody or serous) and/or a palpable mass serve as primary indicators for further investigation. Clinical examination includes manual compression of the tumor area to elicit discharge from the corresponding duct.

2. Imaging Modalities

  • Ultrasonography: Recommended as the first-line imaging tool for both central and peripheral types. Ultrasound sensitivity ranges from 67.3% to 82.9%, but specificity is lower (17.9%–61.5%). For central lesions, it helps exclude other tumors; for peripheral lesions, it aids in localization.
  • Mammography: Used adjunctively, particularly to identify suspicious calcifications associated with malignancy. Sensitivity is moderate (57.1%–62.9%), but it is valuable in differentiating benign from malignant lesions.
  • Magnetic Resonance Imaging (MRI): Superior to galactography for lesions undetected by ultrasound or mammography, though not routinely recommended due to cost and accessibility constraints in China.

3. Ductoscopy

Highly sensitive (94%) but less specific (47%), ductoscopy is prioritized for central lesions with nipple discharge. It allows direct visualization of intraductal abnormalities and targeted biopsy.

4. Cytological Examination of Nipple Discharge

While specificity is high (85.5%), sensitivity is limited (22.8%), making it supplementary rather than definitive.

5. Core Needle Biopsy (CNB) and Vacuum-Assisted Breast Biopsy (VABB)

CNB is recommended for peripheral lesions, with a diagnostic underestimation rate of 15.7%–19.1%. VABB, preferred for imaging-visible lesions, demonstrates a lower underestimation rate (5%) and allows complete excision of smaller tumors.

Surgical Management

Indications for Surgery

All clinically or pathologically diagnosed intraductal papillomas without surgical contraindications warrant excision due to risks of malignancy and underestimation.

Surgical Techniques

  1. Open Surgery:

    • Central Papillomas: Lobectomy or quadrantectomy including duct excision is recommended, particularly for lesions presenting with discharge. This approach ensures complete removal and minimizes recurrence.
    • Peripheral Papillomas: Local excision is sufficient, though larger or multifocal lesions may require extended resection.

  2. Vacuum-Assisted Breast Biopsy (VABB):

    • Suitable for well-defined, imaging-visible lesions. VABB achieves complete resection in smaller tumors and reduces the need for open surgery. For lesions with ADH or uncertainty regarding complete excision, open surgery remains necessary.

  3. Prophylactic Mastectomy:

    • Considered for multifocal lesions involving the entire breast, particularly in high-risk patients. Subcutaneous mastectomy with or without reconstruction is an option.

Special Considerations

Atypical Ductal Hyperplasia (ADH)

The presence of ADH on CNB/VABB necessitates individualized management. If imaging confirms complete excision, surveillance may suffice. In cases of incomplete resection or diagnostic uncertainty, open surgery with wider margins is advised.

Diagnostic Underestimation

The guidelines highlight the importance of post-excision histopathological evaluation. For CNB/VABB-diagnosed papillomas, close follow-up or re-excision is recommended if subsequent imaging reveals residual lesions.

Discussion of Evidence and Rationale

Central vs. Peripheral Papillomas

Central lesions are more accessible to ductoscopy and cytology, whereas peripheral lesions rely on imaging-guided biopsy. The guidelines stress the need for distinct diagnostic pathways: ductoscopy for central lesions and CNB/VABB for peripheral ones.

Imaging Trade-offs

While MRI offers high diagnostic accuracy, its limited availability in China supports the prioritization of ultrasound and mammography. Galactography, though historically used, is omitted due to insufficient evidence supporting its utility.

Surgical Precision

The recommendation for lobectomy in central lesions stems from studies demonstrating 100% sensitivity and specificity for pathological nipple discharge when duct excision is included. VABB’s role is validated by international consensus, which advocates its use for small, imaging-visible papillomas followed by surveillance.

Cost and Accessibility

The guidelines acknowledge regional disparities in healthcare resources. Open surgery remains a viable option in settings where VABB technology is unavailable or cost-prohibitive.

Conclusion

The CSBrS 2021 guidelines provide a comprehensive framework for managing intraductal papilloma, balancing diagnostic accuracy, therapeutic efficacy, and practical feasibility. By integrating clinical presentation, imaging, and histopathology, the recommendations aim to reduce underestimation rates, prevent malignant progression, and optimize patient outcomes. The emphasis on tailored surgical approaches reflects both international standards and local healthcare realities in China.

doi.org/10.1097/CM9.0000000000001533

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