Objective: To determine the upgrade rates to carcinoma and to high-risk lesion (HRL) of benign intraductal papilloma (IDP) diagnosed on core needle biopsy (CNB) at Phramongkutklao (PMK) Hospital and to identify clinical or radiologic factors associated with the upgrading.

Materials and Methods: Benign IDPs diagnosed on CNB between 2012 and 2020 were retrospectively reviewed. The ones with subsequent surgical excision or with more than two years of imaging follow-up to confirm benignity were included. The upgrade rates to carcinoma and to HRL were determined. Clinical and radiologic factors associated with the upgrade were analyzed.

Results: Fifty-six benign IDPs diagnosed on CNB including 41 with subsequent excision and 15 with follow-up management were included. Of the 56 lesions, four (7.14%) were upgraded to carcinoma including three DCIS and one DCIS with grade 1 invasive carcinoma. Upgrade to HRL was found in two lesions (3.57%). No factor was found to be associated with the upgrading.

Conclusion: At PMK Hospital, the upgrade rates of benign IDP diagnosed on CNB to carcinoma and to HRL were 7.14% and 3.57%, respectively. No factor was found to be associated with the upgrading. All upgraded cancers were of the early stage and low grade. Case-by-case management is recommended, based on these results together with patient’s risk, patient’s concern, and follow-up compliance.

Keywords: Benign intraductal papilloma; Breast carcinoma; Breast biopsy; High risk lesion; Upgrade

DOI: doi.org/10.35755/jmedassocthai.2021.09.12590

Received 22 February 2021 | Revised 27 May 2021 | Accepted 1 June 2021