INTRODUCTION: Intraductal papilloma (IDP) is a benign breast lesion that accounts for 3%–6% of core biopsy diagnoses. It is considered a high-risk precursor due to its association with atypia, ductal carcinoma in situ, and invasive carcinoma. Although IDP-NOS (not otherwise specified) rarely progresses to invasive cancer, IDP with atypia carries a higher risk of malignant transformation.
Yamasaki et al. (Thu,) studied this question.