Lesions that should be excised if identified on a needle core biopsy of the breast:
(1) atypical ductal hyperplasia
(2) atypical lobular hyperplasia or lobular carcinoma in situ (lobular neoplasia)
(3) papillary lesion
(4) fibroadenoma with:
(4a) atypical ductal hyperplasia or
(4b) stromal proliferation suggesting a phyllodes tumor
(5) radial scar
(6) columnar cell lesion with hyperplastic features (see below)
(7) mucocele-like lesion or stromal mucin pools
Classification of Brogi and Tan for columnar cell lesion:
(1) mild (nonhyperplastic): single columnar cell layer
(2) moderate:2-4 columnar cell layers
(3) severe: >= 5 columnar cell layers and/or micropapillary tufts and/or cribiform spaces
Moderate and severe columnar cell lesions should be excised.
